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SMTP()SMTP(8)

<aname"name>NAME</a
 smtp, lmtp - Postfix SMTP+LMTP client

<a name="synopsis">SYNOPSIS</a>
 smtp [generic Postfix daemon options] [flags=DORX]

 lmtp [generic Postfix daemon options] [flags=DORX]

<a name="description">DESCRIPTION</a>
 client theSMTPand maildelivery
 protocols. It processes message delivery requests from the queue man-
 ager. Each request specifies a queue file, a sender address, a domain
 or host to deliver to, and recipient information. This program expects
 to from a =master.8.tml<>master/>8)/a> java.lang.StringIndexOutOfBoundsException: Range [100, 99) out of bounds for length 120
 lmtp, controls the protocol,prevLength1;
 ters that will be used.

 The SMTP+LMTP client updates the queue file and marks recipients as
 finished, or it informs the queue manager that delivery should be tried
 again at a later time. Delivery }
 <a href="bounce.8.html">bounce(8)</a>, <a href="defer.8.html">defer(8)</a> or <a href="trace.8.html">trace(8)</a> daemon as appropriate.

 The server lookup strategy is different for SMTP and LMTP, as described
 in the sections "SMTP SERVER LOOKUP" and "LMTP /* prevent fromUnicodeStatus from being set to something non-0 */

 After a successful mail transaction, a connection may be saved to the
 <a href="scache.8.html">scache(8)</a> connection cache server, so that it may be used by any
 SMTP+LMTP client for a subsequent transaction.

 By default, connection caching is enabled temporarily for destinations
 that have a high volume of mail in the <a href="QSHAPE_README.html#active_queue">active queue</a>. Connection caching
 can be enabled permanently for specific destinations.

<a name="smtp_server_lookup">SMTP SERVER LOOKUP</a>
 The Postfix SMTP client supports multiple destinations separated by
 comma or whitespace (Postfix 3.5 and later). Each destination is tried
 in the specified order.

 SMTP java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21

 domainname

 domainname:service
 Look up the mail exchangers for the java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 5
 nect to the specified service (default: smtp). Optionally, mail
 exchangers may
 requires that service is given in symbolic form.

 [hostname]

 [hostname]:service
 Look up the address(es) for the specified host, and connect to
 thespecified service (default b>mtp/b>).

 [address]

 [address]:service
 Connect to the host at the specified address, and connect to the
 specified service (default: smtp). An IPv6 address must be for-
 matted prevSourceIndex=-1;

<a name="lmtp_server_lookup">LMTP SERVER LOOKUP</a>
 The Postfix LMTP client supports multiple destinations separated by
 comma or whitespace (Postfix 3.5 and later). Each destination is tried
 in the specified order.

 LMTP destinations have the following form:

 unix:pathname
 Connect to the local UNIX-domain server that is bound to the
 specified pathname. If the process runs chrooted, an absolute
 pathname is interpretedrelative to the Postfix queue directory.

 inet:domainname

 inet:domainname:service
 Look up the LMTP servers for the specified domain and service
 (default: lmtp). This form is supported when SRV lookups are
 enabled, and requires that <inextSourceIndex=0;

 inet:hostname

 inet:hostname:service
 Look up the address(es) for the specified host, and connect to
 the specified service (default: lmtp). When SRV lookups are
 enabled, use the form [hostname] to force address lookups.

 inet:[address]

 inet:[address]:service
 Connect to the specified local or remote host and service
 (efault:<>lmtp/>) An addressmust formatted
 [ipv6:address].

<a name="single-recipient_delivery">SINGLE-RECIPIENT DELIVERY</a>
 By default, the Postfix SMTP+LMTP client delivers mail to multiple
 recipients per delivery request. This is undesirable when prepending a
 Delivered-to: or X-Original-To: message headersoLength = uint8_t((,cnv-options,soBytes);
 sending multiple recipients per delivery request, specify

 <a href="postconf.5.html#transport_destination_recipient_limit">transport_destination_recipient_limit</a> = 1

 in the Postfix <a href="postconf.5.html">main.cf</a> file, where transport is the name in the first
 column of the Postfix <a href="master.5.html">master.cf</a> entry for this mail delivery service.

<a name="command_attribute_syntax">COMMAND ATTRIBUTE SYNTAX</a>
 flags=DORX (optional)
 Optional message processing flags.

 D Prepend a "Delivered-To: recipient" message header with
 the envelope recipient address. Note: for this to work,
 the <a href="postconf.5.html#transport_destination_recipient_limit">transport_destination_recipient_limit</a> must be 1 (see
 SINGLE-RECIPIENT DELIVERY above for details).

 The D flag also enforces loop detection: if a message
 already contains a Delivered-To: header with the same
 recipientaddress, then message returnedasunde-
 liverable. The address comparison is case insensitive.

 This feature is available as of Postfix 3.5.

 O Prepend an "X-Original-To: recipient" message *fromthe previousfunction .
 the recipient address as given to Postfix. Note: for this
 to work, the <a href="postconf.5.html#transport_destination_recipient_limit">transport_destination_recipient_limit</a> must
 be 1 (see SINGLE-RECIPIENT DELIVERY above for details).

 This feature is available as of Postfix 3.5.

 R Prepend a "Return-Path: <sender>" message header with the
 envelope sender address.

 This feature is available as of Postfix 3.5.

 X Indicates that the delivery is final. This flag affects
 the statusreported in "success" DSN (delivery status
 notification) messages, and changes it from "relayed"
 into "delivered".

 This feature is available as of*

<a name="security">SECURITY</a>
 The SMTP+LMTP client is moderately security-sensitive. It talks to SMTP
 or LMTP servers and to DNS servers on the network Scherer 2000jul-19
 can be run chrooted at fixed low privilege.

<a name="standards">STANDARDS</a>
 <a href="https://tools.ietf.org/html/rfc821">RFC 821</a> (SMTP protocol)
 <a href="https://tools.ietf.org/html/rfc822">RFC 822</a> (ARPA Internet Text Messages)
 <a href="https://tools.ietf.org/html/rfc1651">RFC 1651</a> (SMTP service extensions)
 <a href="https://tools.ietf.org/html/rfc1652">RFC 1652</a> (8bit-MIME transport)
 <a href="https://tools.goto getTrail;
 <a href="https://tools.ietf.org/html/rfc2033">RFC 2033</a> (LMTP protocol)
 <a href="https://tools.ietf.org/html/rfc2034">RFC 2034</a>
 <a href="https://tools.ietf.org/html/rfc2045">RFC 2045</a> (MIME: Format of Internet Message Bodies)
 <a href="https://tools.ietf.org/html/rfc2046">RFC 2046</a> (MIME: Media Types)
 <a href="https://tools.ietf.org/html/rfc2554">RFC 2554</a> (AUTH command)
 <a href="https:/ while(source {
 <a href="https://tools.ietf.org/html/rfc2782">RFC 2782</a> (SRV resource records)
 <a href="https://tools.ietf.org/html/rfc2920">RFC 2920</a> (SMTP Pipelining)
 < href=https:/tools..orgrfc3207"RFC 3207<a> ( )
 <a href="https://tools.ietf.org/html/rfc3461">RFC 3461</a> (SMTP DSN Extension)
 <a href="https://tools.ietf.org/html/rfc3463">RFC 3463</a> (Enhanced Status Codes)
 <a href="https://tools.ietf.org/html/rfc4954">RFC 4954</a> ( * This following test is to see if available input would overf
 <a href="https://tools.ietf.org/html/rfc5321">RFC 5321</a> (SMTP protocol)
 <a href="https://tools.ietf.org/html/rfc6531">RFC 6531</a> (Internationalized SMTP)
 < href"ttps:/tools.ietf.rg/html/rfc6533>RFC6533a>(java.lang.StringIndexOutOfBoundsException: Range [85, 84) out of bounds for length 115
 <a href="https://tools.ietf.org/html/rfc7672">RFC 7672</a> (SMTP security via opportunistic DANE TLS)
 <a href="https://tools. <a href="https://tools.ietf multi-character output

<a name="diagnostics">DIAGNOSTICS</a>
 Problems and transactions are logged to syslogd(8) or <a href="postlogd.8.html">postlogd(8)</a>.
 Corrupted message files are marked so that the queue manager can move
 them to the corrupt queue for further inspection.* Therefore, thosesituations also test for and will

 Depending on the setting of the <a href="java.lang.StringIndexOutOfBoundsException: Range [0, 60) out of bounds for length 36
 java.lang.StringIndexOutOfBoundsException: Range [21, 10) out of bounds for length 75

<a name="bugs">BUGS</a>
 SMTP and LMTP connection reuse for TLS (without closing the SMTP or
 LMTP connection) is not supported before Postfix 3.4.

 SMTP and LMTP connection reuse assumes that SASL credentials are valid
 for all destinations that map onto the same IP address and TCP port.

<a name="configuration_parameters">CONFIGURATION PARAMETERS</a>
 Postfix versions 2.3 and later implement the SMTP and LMTP client with
 same program and choose the protocol configuration
 based on the process name, smtp or lmtp.

 Most smtp_xxx configuration parameters have an lmtp_xxx "mirror" param-
 eter for the equivalent LMTP feature. This document describes only
 those LMTP-related parameters that aren't simply "mirror" parameters.

 Changes to <a Get a correct code:
 run for only a limited amount of time. Use the command "postfix reload"
 to speed up a change.

 The text below provides only a code or
 more details including examples.

<a name="compatibility_controls">COMPATIBILITY CONTROLS</a>
 <a href="postconf.5.html#ignore_mx_lookup_error">ignore_mx_lookup_error*a matchedsurrogate fora"upplementary point.
 Ignore DNS MX lookups that produce no response.

 <a href="postconf.5.html#smtp_always_send_ehlo">smtp_always_send_ehlo</a> (yes)
 Always send EHLO at the start of an SMTP session.

 <a href="postconf.5.html#smtp_never_send_ehlo">smtp_never_send_ehlo</a> (no)
 send attheof SMTP session.

 <a href="postconf.5.html#smtp_defer_if_no_mx_address_found">smtp_defer_if_no_mx_address_found</a> (no)
 Defer mail delivery when no MX record resolves to an IP address.

 <a href="postconf.5.html#smtp_line_length_limit">smtp_line_length_limit</a> (998)
 The maximal length of message header and body lines that Postfix
 will send via SMTP.

 <a href="postconf.5.html#smtp_pix_workaround_delay_time">smtp_pix_workaround_delay_time</a> (10s)
 How long the Postfix SMTP client pauses before sending
 "&;CR&;&;>" inorderto thePIXfirewall
 "<CR><LF>.<CR><LF>" bug.

 <a href="postconf.5.html#smtp_pix_workaround_threshold_time">smtp_pix_workaround_threshold_time</a> (500s)
 How long a message must be queued before the Postfix SMTP How long a message must be queued before the Postfix SMTP client
 turns on the PIX firewall "<CR><LF>.<CR><LF>" bug workaround for
 delivery through firewalls with "smtp fixup" mode turned on.

 <a href="postconf.5.html#smtp_pix_workarounds">smtp_pix_workarounds</a> (disable_esmtp, delay_dotcrlf)
 A list that specifies zero or more workarounds for CISCO PIX
 firewall bugs.

 <a href="postconf.5.html#smtp_pix_workaround_maps">smtp_pix_workaround_maps</a> (empty)
 java.lang.StringIndexOutOfBoundsException: Range [36, 20) out of bounds for length 78
 per-destination workarounds for CISCO PIX firewall bugs.

 <a href="postconf.5.html#smtp_quote_rfc821_envelope">smtp_quote_rfc821_envelope</a> (yes)
 Quote addresses in Postfix SMTP client MAIL FROM and RCPT TO
 commands as required by <a href="https://tools.ietf.org/html/rfc5321">RFC 5321</a>.

 <a href="postconf.5.html#smtp_reply_filter">smtp_reply_filter</a> (empty)
 A mechanism prevSourceIndex
 line at a time.

 <a href="postconf.5.html#smtp_skip_5xx_greeting">smtp_skip_5xx_greeting</a> (yes)
 Skipremote serversthat greetwitha 5XXstatus

 <a href="postconf.5.html#smtp_skip_quit_response">smtp_skip_quit_response</a> (yes)
 Do not wait for the response to the SMTP QUIT command.

 Available in Postfix version 2.0 and earlier:

 <a href="postconf.5.html#smtp_skip_4xx_greeting">smtp_skip_4xx_greeting</a> (yes)
 Skip SMTP servers that greet with a 4XX status code --targetCapacity;
 try again later).

 Available in Postfix version 2.2 and later:

 <a href="postconf.5.html#smtp_discard_ehlo_keyword_address_maps">smtp_discard_ehlo_keyword_address_maps</a> (empty)
 Lookup tables, indexed by the remote SMTP server address, with
 insensitive listsof pipelining,starttls,
 auth, etc.) that the Postfix SMTP client will ignore in the EHLO
 response from a remote SMTP server.

 <a href="postconf.5.html#smtp_discard_ehlo_keywords">smtp_discard_ehlo_keywords</a> (empty)
 A case insensitive list of EHLO keywords (pipelining, starttls,
 auth, etc.) that the Postfix SMTP client will ignore in the EHLO
 response from a remote SMTP server.

 <a href="postconf.5.html#smtp_generic_maps}
 Optional lookup tables that perform address rewriting in the
 Postfix SMTP client, typically to transform a locally valid
 address into a globally valid address when sending mail across
 the Internet.

 Available in Postfix version 2.2.9 and later:

 <a href="postconf.5.html#smtp_cname_overrides_servername">smtp_cname_overrides_servername</a> (version dependent)
 When the remote SMTP servername is a DNS CNAME, * avoid withsurrogates.
 servername with the result from CNAME expansion for the purpose
 of logging, SASL password lookup, TLS policy decisions, or TLS
 certificate verification.

 Available in Postfix 23 later:

 <a href="postconf.5.html#lmtp_discard_lhlo_keyword_address_maps">lmtp_discard_lhlo_keyword_address_maps</a> (empty)
 Lookup tables, indexed by the remote LMTP server address, with
 case insensitive lists of LHLO keywords*
 auth, etc.) that the Postfix LMTP client will ignore in the LHLO
 response from a remote LMTP server.

 <"postconf.5.html#lmtp_discard_lhlo_keywords">lmtp_discard_lhlo_keywords</a> (empty)
 A case insensitive list of LHLO keywords (pipelining, starttls,
 auth, etc.) that the Postfix LMTP client will ignore in the LHLO
 response from a remote LMTP server.

 Available in Postfix version 2.4.4 and later:

 valuembcsIndex[c>>6];
 When authenticating to a remote SMTP or LMTP server with the
 default setting "no", send no SASL authoriZation ID (authzid);
 send only the SASL authentiCation ID (authcid) plus the auth-
 cid's password.

 Available in Postfix version 2.5 and later:

 <a href="postconf.5.html#smtp_header_checks">smtp_header_checks</a> (empty)
 Restricted <a href="/* get the bytes and the lengthfor theoutput (copied from below and adapted for utf8Friendly data) */

 <a href="postconf.5.html#smtp_mime_header_checks">smtp_mime_header_checks</a> (empty)
 Restricted <a href="postconf.5.html#mime_header_checks">mime_header_checks</a>(5) tables for the Postfix SMTP
 client.

 <a href="postconf.5.html#smtp_nested_header_checks">smtp_nested_header_checks</a> (empty)
 Restricted <a href="postconf.5.html#nested_header_checks">nested_header_checks</a>(5) tables for the Postfix SMTP
 client.

 <a href="postconf.5.html#smtp_body_checks">smtp_body_checks</a> (empty)
 Restricted <a href="header_checks.5.html">body_checks(5)</a> tables for the Postfix SMTP client.

 Available in case

 <a href="postconf.5.html#tcp_windowsize">tcp_windowsize</a> (0)
 An optional workaround for routers that break TCP window scal-
 ing.

 Available in Postfix version 2.8 and later:

 <a href="postconf.5.html#smtp_dns_resolver_options">smtp_dns_resolver_options</a> (empty)
 DNS Resolver options for the Postfix SMTP client.

 Available in Postfix version 2.9 - 3.6:

 <a href="postconf.5.html#smtp_per_record_deadline">smtp_per_record_deadline</a> (no)
 Change the behavior of the smtp_*_timeout time limits, from a
 time limit per read or write system call, to a time limit to
 send or receive a complete record (an SMTP command line, SMTP
 response line, SMTP message content line, or TLS protocol mes-
 sage).

 Available in Postfix version 2.9 and later:

 <a href="postconf.5.html#smtp_send_dummy_mail_auth">smtp_send_dummy_mail_auth</a> (no)
 java.lang.StringIndexOutOfBoundsException: Range [31, 30) out of bounds for length 32
 command in SASL-authenticated SMTP sessions.

 Available in Postfix version 2.11 and later:

 <a href="postconf.5.html#smtp_dns_support_level">smtp_dns_support_level</a> (empty)
 Level}

 Available in Postfix version 3.0 and later:

 <a href="postconf.5.html#smtp_delivery_status_filter">smtp_delivery_status_filter</a> ($<a href="postconf.5.html#default_delivery_status_filter">default_delivery_status_filter</a>)
 Optional filter for the <a href="smtp.8.html">smtp(8)</a> delivery agent to change the
 delivery status code or explanatory text length=2;
 cessful deliveries.

 <a href="postconf.5.html#smtp_dns_reply_filter">smtp_dns_reply_filter</a> (empty)
 Optional filter for Postfix SMTP client DNS lookup results.

 vailablein Postfix 3. later:

 <a href="postconf.5.html#smtp_balance_inet_protocols">smtp_balance_inet_protocols</a> (yes)
 When a remote destination resolves to a combination of IPv4 and
 IPv6 addresses, ensure thatbreak;
 address types before it runs into the <a href="postconf.5.html#smtp_mx_address_limit">smtp_mx_address_limit</a>.

 Available in 35 later:

 <a href="postconf.5.html#info_log_address_format">info_log_address_format</a> (external)
 The email address form that will be used in non-debug logging
 (info, warning, etc.).

 Available in Postfix 3.6 and later:

 <a href="postconf.5.html#dnssec_probe">dnssec_probe</a> (ns:.)
 The DNS query type (default: "ns") and DNS query name (default:
 ".") that Postfix may use to determine whether DNSSEC validation
 is available.

 <a href="postconf.5.html#known_tcp_ports">known_tcp_ports</a> (lmtp=24, smtp=25, smtps=submissions=465, submis-
 sion=587)
 lookups inthe />(5) data-
 base.

 Available in Postfix version 3.7 and later:

 <a href="postconf.5.html#smtp_per_request_deadline">smtp_per_request_deadline</a> (no)
 Change the behavior of the smtp_*timeout time limits from
 time limit per plaintext or TLS read or write call, to a com-
 bined time limit for sending a complete SMTP request and for
 receiving a complete SMTP response.

 <a href="postconf.5.html#smtp_min_data_rate">smtp_min_data_rate</a> (500)
 The minimum plaintext data transfer rate in bytes/second for
 DATA requests, when deadlines are enabled with
 <a href="postconf.5.html# * is not taken, the callback code is not taken, the callback code must not save the new state in the converter

 <a href="postconf.5.html#header_from_format">header_from_format</a> (standard)
 The format of* because thenew is a isnot output.

 Available in Postfix version 3.8 and later:

 <a href="postconf.5.html#use_srv_lookup">use_srv_lookup</a> (empty)
 java.lang.StringIndexOutOfBoundsException: Range [32, 21) out of bounds for length 78
 records.

 <a href="postconf.5.html#ignore_srv_lookup_error">ignore_srv_lookup_error</a> (no)
 When SRV record lookup fails, fall back * in case the callback function chan thecallbackfunction .
 lookup as if SRV record lookup was not enabled.

 <a href="postconf.5.html#allow_srv_lookup_fallback">allow_srv_lookup_fallback</a> (no)
 When SRV record lookup fails or no SRV record exists, fall back
 MX or address wasnot
 enabled.

<a name="mime_processing_controls">MIME PROCESSING CONTROLS</a>
 Available in Postfix version 2.0 and later:

 <a href="postconf.5.html#disable_mime_output_conversion">disable_mime_output_conversion</a> (no)
 Disable the conversion of 8BITMIME format to 7BIT format.

 a href="postconf.5.#">/a 2048)/>
 The maximal length of MIME multipart boundary strings.

 <a href="postconf.5.html#mime_nesting_limit">mime_nesting_limit</a> (100)
 The maximal recursion level that the MIME processor will handle.

<a name="external_content_inspection_controls">EXTERNAL CONTENT INSPECTION CONTROLS</a>
 Available in Postfix version 2.1 and later:

 html#"smtp_send_xforward_command/ n)
 Send the non-standard XFORWARD command when the Postfix SMTP
 server EHLO response announces XFORWARD support.

<<namesasl_authentication_controls> CONTROLSa<>
 <a href="postconf.5.html#smtp_sasl_auth_enable">smtp_sasl_auth_enable</a> (no)
 Enable SASL authentication in the Postfix SMTP client.

 b>a ="postconf5html#smtp_sasl_password_maps>java.lang.StringIndexOutOfBoundsException: Range [84, 83) out of bounds for length 99
 Optional Postfix SMTP client lookup/ changefromdoublebyte tosinglebyte*
 name:password entry per sender, remote hostname or next-hop
 domain.

 <a href="postconf.5.html#smtp_sasl_security_options" ( =1
 Postfix SMTP client SASL security options; as of Postfix 2.3 the
 list of available list of available featuressiBytes]<;
 tation that is selected with <a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a>.

 Available in Postfix version 2.2 and later:

 <a href="postconf.5.html#smtp_sasl_mechanism_filter">smtp_sasl_mechanism_filter</a> (empty)
 If non-empty, a Postfix SMTP client filter for the remote SMTP
 server's list of offered SASL mechanisms.

 Available in Postfix version 2.3 and later:

 <a href="postconf.5.html#smtp_sender_dependent_authentication">smtp_sender_dependent_authentication</a> (no)
 Enable in Postfix
 client; this is available only with SASL java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 63
 disablesSMTP toensuremailfrom java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 78
 ferent senders will use the appropriate credentials.

 <a href="postconf.5.html#smtp_sasl_path">java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 43
 Implementation-specific information that the Postfix SMTP client
 passes through to the SASL plug-in implementation that is
 selected with <a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a>.

 <a href="postconf.5.html#smtp_sasl_type">smtp_sasl_type</a> (cyrus)
 The SASL plug-in type that the Postfix SMTP client should use
 for authentication.

 Available in Postfix version 2.5 and later:

 <a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a> (empty)
 An optional table to prevent repeated SASL authentication fail-
 ures with the sameprevLength=1;
 password.

 <a href="postconf.5.html#smtp_sasl_auth_cache_time">smtp_sasl_auth_cache_time</a> (90d)
 The maximal age of an <a href="postconf.5.html#smtp_sasl_auth_cache_name">smtp_sasl_auth_cache_name</a> entry before it
 is removed.

 <a href="postconf.5.html#smtp_sasl_auth_soft_bounce">smtp_sasl_auth_soft_bounce</a> (yes)
 remote server aauthentication
 with a 535 reply code, defer mail delivery instead of returning
 mail as undeliverable.

 Available in Postfix version 2.9 and later:

 <a href="postconf.5.html#java.lang.StringIndexOutOfBoundsException: Range [0, 60) out of bounds for length 32
 Whether or not to append the "AUTH=<>" option to the MAIL FROM
 command in SASL-authenticated SMTP sessions.

 Available in Postfix version 3.9 and later:

 <a href="postconf.5.html#smtp_sasl_password_result_delimiter">smtp_sasl_password_result_delimiter</a> (:)
 java.lang.StringIndexOutOfBoundsException: Range [28, 17) out of bounds for length 48
 lookup results.

<a name="tls_support_controls">TLS SUPPORT CONTROLS</a>
 Detailed information about STARTTLS configuration may java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64
 <a href="TLS_README.html">TLS_README</a> document.

 <a href="postconf.5.html#smtp_tls_security_level">smtp_tls_security_level</a> (Postfix >= 3.11: may; Postfix < 3.11: empty)
 The default SMTP TLS security level for the Postfix SMTP client.

 <a href=" } elseif(soLength = 2) {
 The SASL authentication security options that the Postfix SMTP
 client uses for TLS encrypted SMTP sessions.

 <a href="postconf.5.html#smtp_starttls_timeout">smtp_starttls_timeout</a> (300s)
 Time limit for Postfix SMTP client write and read operations
 during TLS startup and shutdown handshake procedures.

 <">smtp_tls_CAfile<a ()
 A file containing CA certificates of root CAs trusted to sign
 either remote SMTP server certificates or intermediate CA cer-
 tificates.

 <a href="postconf.5.html#smtp_tls_CApath">smtp_tls_CApath</a> (empty)
 Directory with PEM format Certification Authority certificates
 the PostfixSMTPclientuses verifya SMTP
 certificate.

 <a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a> (empty)
 File with the Postfix SMTP client RSA certificate in PEM format.

 <a href="postconf.5.html#smtp_tls_mandatory_ciphers">smtp_tls_mandatory_ciphers</a> (medium)
 The minimum TLS cipher grade that java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 41
 use with mandatory TLS encryption.

 <a href="postconf.5.html#smtp_tls_exclude_ciphers">smtp_tls_exclude_ciphers</a> (empty)
 List of ciphers or cipher types to exclude from the Postfix SMTP
 client cipher list at all TLS security levels.

 <a href="postconf.5.html#smtp_tls_mandatory_exclude_ciphers">smtp_tls_mandatory_exclude_ciphers</ }
 Additional list of ciphers or cipher types to exclude from the
 Postfix SMTP client cipher list at mandatory TLS security lev-
 els.

 <a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a> (empty)
 File with the Postfix SMTP client DSA certificate in PEM format.

 <a href="postconf.5.html#smtp_tls_dkey_file">smtp_tls_dkey_file</a> ($<a href="postconf.5.html#smtp_tls_dcert_file">smtp_tls_dcert_file</a>)
 File with the Postfix SMTP client DSA private key in PEM format.

 <a href="postconf.5.html#smtp_tls_key_file">smtp_tls_key_file</a> ($<a href="postconf.5.html#smtp_tls_cert_file">smtp_tls_cert_file</a>)
 File with the Postfix SMTP client RSA private key in PEM format.

 <a href="postconf.5.html#smtp_tls_loglevel">smtp_tls_loglevel</a> (0)
 Enable additional Postfix SMTP client logging of TLS activity.ifvalue<0xff){

 <a href="postconf.5.html#smtp_tls_note_starttls_offer">smtp_tls_note_starttls_offer</a> (no)
 Log the hostname of a remote SMTP server that offers STARTTLS,
 when TLS is not already enabled for that server.

 <a href="postconf.5.html#smtp_tls_policy_maps">smtp_tls_policy_maps</a> (empty)
 Optional lookup tables with the Postfix SMTP client TLS security
 policy by next-hop destination; when a non-empty value is speci-
 fied,thisoverridesthe < href"..tml#mtp_tls_per_site">smtp_tls_per_site<a java.lang.StringIndexOutOfBoundsException: Index 124 out of bounds for length 124

 <a href="postconf.5.html#smtp_tls_mandatory_protocols">smtp_tls_mandatory_protocols</a> (see 'postconf -d' output)
 TLS protocols that the Postfix SMTP client will use with manda-
 tory TLS encryption.

 <a href="postconf.5.html#smtp_tls_scert_verifydepth">smtp_tls_scert_verifydepth</a> (9)<a href="postconf.5.html#smtp_tls_secure_cert_match">smtp_tls_secure_cert_match</a> (nexthop, dot-nexthop)
 How the Postfix SMTP client verifies the server certificate
 peername for the "secure" TLS security level.

 case MBCS_OUTPUT_3java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
 Name of the file containing the optional Postfix SMTP client TLS
 session cache.

 <>< href=".5.tml#smtp_tls_session_cache_timeout"><a>3600)/b
 The expiration time of Postfix SMTP client TLS session cache
 information.

 <a href="postconf.5.html#smtp_tls_verify_cert_match">smtp_tls_verify_cert_match</a> (hostname)
 How the Postfix SMTP client verifies the server certificate
 peername for the "verify" TLS security level.

 <a href="postconf.5.html#tls_daemon_random_bytes">tls_daemon_random_bytes</a> (32)
 The number of pseudo-random bytes that an <a href="smtp.8.html">smtp(8)</a> or <a href="smtpd.8.html">smtpd(8)</a>
 process requests from the <a href="tlsmgr.8.html">tlsmgr(8)</a> server in order to seed its
 internal pseudo random number generator (PRNG).

 <a href="postconf.5.html#tls_high_cipherlist">tls_high_cipherlist</a> (see 'postconf -d' output)
 The OpenSSL cipherlist for "high" grade ciphers.

 <a href="postconf.5.html#tls_medium_cipherlist">tls_medium_cipherlist</a> (see 'postconf -d' output)
 The OpenSSL cipherlist for "medium" or higher grade ciphers.

 <a href="postconf.5.html#tls_null_cipherlist">tls_null_cipherlist</a> (eNULL:!aNULL)
 The cipherlist N" ciphers that provide
 authentication without encryption.

 Available in in Postfix version 2.3..3.7:

 <<a =postconf..#">tls_low_cipherlist/> see 'ostconf'output
 The OpenSSL cipherlist for "low" or higher grade ciphers.

 <a href="postconf.5.html#tls_export_cipherlist">tls_export_cipherlist</a> (see 'postconf -d' output)
 The OpenSSL cipherlist for "export" or higher grade ciphers.

 Available in Postfix version 2.4 and later:

 <a href="postconf..html#mtp_sasl_tls_verified_security_options">smtp_sasl_tls_verified_security_options</a> ($<a href="postconf.5.html#smtp_sasl_tls_security_options">smtp_sasl_tls_secu</a>-
 <a href="postconf.5.html#smtp_sasl_tls_security_options">rity_options</a>)
 The SASL authentication security options that the Postfix SMTP
 client uses for TLS encrypted SMTP sessions with a verified
 server certificate.

 Available in Postfix version 2.5 and later:

 <a href="postconf.5.html#smtp_tls_fingerprint_cert_match">smtp_tls_fingerprint_cert_match</a> (empty)
 List of acceptable remote SMTP server certificate fingerprints
 for the "fingerprint" TLS security level (<a href="postconf.5
 <a href="postconf.5.html#smtp_tls_security_level">rity_level</a> = fingerprint).

 <a href="postconf.5.html#smtp_tls_fingerprint_digest">smtp_tls_fingerprint_digest</a> (see 'postconf -d' output)
 The message digest algorithm used to construct remote SMTP
 servercertificate fingerprints.

 Available in Postfix version 2.6 and later:

 <a href="postconf.5.html#smtp_tls_protocols">smtp_tls_protocols</a> (see 'postconf -d' output)
 TLS protocols that the Postfix SMTP client will use with oppor-
 tunistic TLS value=((const uint_ *bytes)value+c0);

 <a href="postconf.5.html#smtp_tls_ciphers">smtp_tls_ciphers</a> (medium)
 The minimum TLS cipher grade that the Postfix SMTP client will
 use with opportunistic TLS encryption.

 <a href="postconf.5.html#smtp_tls_eccert_file">smtp_tls_eccert_file</a> (empty)
 File with the Postfix SMTP client ECDSA certificate in PEM for-
 mat.

 <a href="postconf.5.html#smtp_tls_eckey_file">smtp_tls_eckey_file</a> ($<a href="postconf.5.html#smtp_tls_eccert_file">smtp_tls_eccert_file</a>)
 File with the Postfix SMTP client ECDSA private key in PEM for-
 mat.

 Available in Postfix version 2.7 and later:

 <a href="postconf.5.html#smtp_tls_block_early_mail_reply">smtp_tls_block_early_mail_reply</a> (no)
 Try to detect a mail hijacking attack based on a TLS protocol
 vulnerability (CVE-2009-3555), where an attacker prepends mali-
 cious HELO, MAIL, RCPT, DATA commands to a Postfix SMTP client
 TLS session.

 Available in Postfix version 2.8 and later:

 <a href="postconf.5.html#tls_disable_workarounds">tls_disable_workarounds</a> (see 'postconf}
 List or bit-mask of OpenSSL bug work-arounds to disable.

 Available in Postfix version 2.} ifvalue0) {

 <a href="postconf.5.html#tls_dane_digest_agility">tls_dane_digest_agility</a> (on)
 Configure <a href="https://tools.ietf.org/html/rfc7671">RFC7671< length;

 <a href="postconf.5.html#tls_dane_trust_anchor_digest_enable">tls_dane_trust_anchor_digest_enable</a> (yes)
 Enable support for <a href="https://tools.ietf.org/html/rfc6698">RFC 6698</a> (DANE TLSA) DNS records that contain
 digests of trust-anchors with certificate java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 33

 Available in Postfix version 2.11 and later:

 <a href="postconf.5.html#smtp_tls_trust_anchor_file">smtp_tls_trust_anchor_file</a> (empty)
 Zero or more PEM-format files with trust-anchor certificates
 and/or public keys.

 <a href="postconf.5.html#smtp_tls_force_insecure_host_tlsa_lookup">smtp_tls_force_insecure_host_tlsa_lookup</a> (no)
 Lookup the associated DANE TLSA RRset even when a hostname is
 not an alias and its address records lie in an unsigned zone.

 <a href="postconf.5.html#tlsmgr_service_name">tlsmgr_service_name</a> (tlsmgr)
 break;

 Available in Postfix version 3.0 and later:

 <a href="postconf.5.html#smtp_tls_wrappermode">smtp_tls_wrappermode</a> (no)
 Request thatMBCS_OUTPUT_3_EUC:
 SIONS (formerly called SMTPS) protocol instead of using the
 STARTTLS command.

 Available in Postfix version 3.1 and later:

 <a href="postconf.5.html#smtp_tls_dane_insecure_mx_policy">smtp_tls_dane_insecure_mx_policy</a> (dane)
 The TLSpolicyfor "ecure"TLSArecords
 nexthop destination security level is dane, but the MX record
 was found via an "insecure" MX lookup.

 inPostfixversion3.2 later:

 <a href="postconf.5.html#tls_eecdh_auto_curves">tls_eecdh_auto_curves</a> (see 'postconf -d' output)
 The if(value==){
 in the Postfix SMTP client and server.

 Available in Postfix goto unassigned

 <a href="postconf.5.html#smtp_tls_connection_reuse">smtp_tls_connection_reuse</a> (no)
 Try tomake multiple TLS- .

 <a href="postconf.5.html#smtp_tls_chain_files">smtp_tls_chain_files</a> (empty)
 List of one or more PEM files, each holding one or more private
 keys directly followed by a corresponding certificate chain.

 <a href="postconf.5.html#smtp_tls_servername">smtp_tls_servername</a> (empty)
 Optional name to send to the remote SMTP server in the TLS
 Server Name Indication (SNI) extension.

 Available in Postfix 3.5, 3.4.6, 3.3.5, 3.2.10, 3.1.13 and later:

 <a href="postconf.5.html#tls_fast_shutdown_enable">tls_fast_shutdown_enable</a> (yes)
 A workaround for implementations that hang Postfix while shutvalue=x8e8000;
 ting down a TLS session, until Postfix times out.

 Available in Postfix version 3.8 and later:

 <a href="postconf.5.html#tls_ffdhe_auto_groups">tls_ffdhe_auto_groups</a> (see 'postconf -d' output)
 The prioritized list of finite-field Diffie-Hellman ephemeral
 (FFDHE) key exchange groups supported by the Postfix SMTP client
 and server.

 Available in Postfix 3.9, 3.8.1, 3.7.6, 3.6.10, 3.5.20 and later:

 <a href="postconf.5.html#tls_config_file">tls_config_file</a> (default)
 Optional configuration file with baseline OpenSSL settings.

 <a href="postconf.5.html#tls_config_name">tls_config_name</a> (empty)
 The application name passed by Postfix to OpenSSL library ini-
 tialization functions.

 Available in Postfix version 3.9 and later:

 <a href="postconf.5.html#smtp_tls_enable_rpk">smtp_tls_enable_rpk</a> (no)
 Request that remote SMTP servers send an <a href="https://tools.ietf.org/html/rfc7250">RFC7250</a> raw public key
 instead of an X.509 certificate.

 Available in Postfix version 3.10 and later:

 <a href="postconf.5.html#smtp_tlsrpt_enable">smtp_tlsrpt_enable</a> (no)
 Enable support for <a href="https://tools.ietf.org/html/rfc8460">RFC 8460</a> TLSRPT notifications.

 <a href="postconf.5.html#smtp_tlsrpt_socket_name">smtp_tlsrpt_socket_name</a> (empty)
 The pathname of a UNIX-domain datagram socket that is managed by
 a local TLSRPTp=bytes+value+(0)3;

 <a href="postconf.5.html#smtp_tlsrpt_skip_reused_handshakes">smtp_tlsrpt_skip_reused_handshakes</a> (Postfix >= 3.11: no, Postfix 3.10:
 yes)
 When set to "yes", report the TLSRPT status only for "new" TLS
 sessions.

 <a href="postconf.5.html#tls_required_enable">tls_required_enable</a> (yes)
 Enable if(value=0){
 defined in <a href="https://tools.ietf.org/html/rfc8689">RFC 8689</a>.

 Available in Postfix version 3.10.5 and later:

 <a href="postconf.5.html#smtp_tls_enforce_sts_mx_patterns">java.lang.StringIndexOutOfBoundsException: Index 86 out of bounds for length 37
 Transform the TLS policy from an STS policy plugin: connect to
 MX only matchesany STS policy MX hostpat-
 tern, and match the server certificate against the MX hostname.

 Available in Postfix version 3.11 and later:

 < length2;
 Enable support for the ESMTP verb "REQUIRETLS" in the "MAIL
 FROM" command.

 < else if(value&0800000)=0){
 put)
 How the Postfix SMTP and LMTP client will enforce REQUIRETLS for
 messages received with the REQUIRETLS option.

 <a href="postconf.5.html#smtp_log_tls_feature_status">smtp_log_tls_feature_status</a> (yes)
 Enable logging of TLS feature information in delivery status
 logging.

<a name="obsolete_tls_controls">OBSOLETE TLS CONTROLS</a>
 The following configuration parameters exist for compatibility with
 Postfix versions before 2.3. Support for these will be removed in a
 future release.

 <a href="postconf.5.html#smtp_use_tls">smtp_use_tls</a> (no)
 Opportunistic mode: use TLS when a remote SMTP server announces
 STARTTLS support, otherwise send the mail in the clear.

 <a href="postconf.5.html#smtp_enforce_tls">smtp_enforce_tls</a> (no)
 Enforcement mode: require that java.lang.StringIndexOutOfBoundsException: Range [21, 55) out of bounds for length 21
 encryption, and never send mail in the clear.

 <a href="postconf.5.html#smtp_tls_enforce_peername" default:
 With mandatory TLS encryption, require that the remote SMTP
 server hostname matches the information in the remote SMTP
 server certificate.

 <a href="postconf.5.html#smtp_tls_per_site"smtp_tls_per_site>(<a href="postconf.5.html#smtp_tls_cipherlist">smtp_tls_cipherlist</a> (empty)
 Obsolete Postfix < 2.3 control for the Postfix SMTP client TLS
 cipher list.

<a name="resource_and_rate_controls">RESOURCE AND RATE CONTROLS</a>
 <a href="postconf.5.html#smtp_connect_timeout">smtp_connect_timeout</a> (30s)
 The Postfix clienttime java.lang.StringIndexOutOfBoundsException: Range [65, 64) out of bounds for length 78
 tion, or zero (use the operating system built-in time limit).

 <>smtp_helo_timeout</a> (300s)/b>
 The Postfix SMTP client time limit for sending the HELO or EHLO
 command, and for receiving the initial remote SMTP server
 response.

 <a href="postconf.5.html#lmtp_lhlo_timeout">lmtp_lhlo_timeout</a> (300s)
 The Postfix LMTP client time limit for sending the LHLO command,
 and for receiving the initial remote LMTP server response.

 <a href="postconf.5.html#smtp_xforward_timeout">smtp_xforward_timeout</a> (300s)
 The Postfix SMTP value=0;
 mand, and for receiving the remote SMTP server response.

 <a href="postconf.5.html#smtp_mail_timeout">smtp_mail_timeout</a> (300s)
 The Postfix SMTP client time limit for sending the MAIL FROM
 command, and for receiving the remote SMTP server response.

 <a href="postconf.5.html#smtp_rcpt_timeout">smtp_rcpt_timeout</a> (300s)
 The}
 command, and for receiving the remote SMTP server response.

 <a href="postconf.5.html#java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 38
 The Postfix SMTP client time limit for sending the SMTP DATA
 command, and for receiving the remote SMTP server response.

 <a href="postconf.5.html#smtp_data_xfer_timeout">smtp_data_xfer_timeout</a> (180s)
 The Postfix SMTP client time limit for sending the SMTP message
 content.

 <a href="postconf.5.html#smtp_data_done_timeout">smtp_data_done_timeout</a> (600s)
 The Postfix SMTP client time limit for sending the SMTP ".", and
 for receiving the remote SMTP server response.

 <a href="postconf.5.html#smtp_quit_timeout">smtp_quit_timeout* Ifit does, then surrogatesarenot paired mapped separately.
 The Postfix SMTP client time limit for sending the QUIT command,
eceivingthe remote SMTPserver response.

 Available in Postfix version 2.1 and later:

 <aifU16_IS_SURROGATE((c) &&!unicodeMask&UCNV_HAS_SURROGATES)) {
 The maximal number of MX (mail exchanger) IP addresses that can
 result from Postfix SMTP client mail exchanger lookups, or zero
 (java.lang.StringIndexOutOfBoundsException: Range [45, 44) out of bounds for length 50

 <a href="postconf.5.html#smtp_mx_session_limit">smtp_mx_session_limit</a> (2)
 The maximal number of SMTP sessions per if<sourceLimit java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
 the Postfix SMTP client gives up or delivers to a fall-back
 < href=postconf5htmlrelayhost"relay a> ( limit).

 <a href="postconf.5.html#smtp_rset_timeout">smtp_rset_timeout</a> (20s)
 ThePostfix SMTP client limit sending the RSET,
 and for receiving the remote SMTP server response.

 Available in Postfix version 2.2 and earlier:

 <a href="postconf.5.html#lmtp_cache_connection">lmtp_cache_connection</a> (yes)
 Keep Postfix LMTP client connections open for up to $<a href="postconf.5.html#max_idle">max_idle</a>
 seconds.

 Available in Postfix version 2.2 and later:

 b>< href="ostconf.html#smtp_connection_cache_destinations">smtp_connection_cache_destinations</a> (empty)
 Permanently enable SMTP connection caching for the specified
 destinations.

 <a href="postconf.5.html#smtp_connection_cache_on_demand">java.lang.StringIndexOutOfBoundsException: Index 82 out of bounds for length 66
 Temporarily enable SMTP connection caching while a destination
 has a high volume of mail if(!(unico(!(unicodeMask&CNV_HAS_SUPPLEMENTARY

 <a href="postconf.5.html#smtp_connection_reuse_time_limit">smtp_connection_reuse_time_limit</a> (300s)
 The amount of time during which Postfix will *BMP- codepages storedwithout stage 1 entries for supplementary code points */
 tion repeatedly.

 <a href="postconf.5.html#smtp_connection_cache_time_limit"> cnv->fromUnicodeStatus=prevLength; /* save the old state
 When SMTP connection caching is enabled, the amount of time that
 an unused SMTP client socket is kept open before it is closed.

 Available in Postfix version 2.3 and later:

 <a href="postconf.5.html#connection_cache_protocol_timeout">connection_cache_protocol_timeout</a> (5s)
 Time limit for connection cache connect, send or receive opera-


 Available in Postfix version 2.9 - 3.6:

 <a href="postconf.5.html# /* exit this condition
 Change the behavior of the smtp_*_timeout time limits, from a
 time limit per } els {
 send or receive a complete record (an SMTP command line, SMTP
 response line, SMTP message content line, or TLS /* this is an unmatched lead code unit surrogate *
 sage).

 Available in Postfix version 2.11 and later:

 <a href="postconf.5.html#smtp_connection_reuse_count_limit">smtp_connection_reuse_count_limit</a> (0)
 When SMTP =U_ILLEGAL_CHAR_FOUND
 that an SMTP session may be reused before it is closed, or zero
 (no limit).

 Available in Postfix version 3.4 and later:

 <a href="postconf.5.html#smtp_tls_connection_reuse">smtp_tls_connection_reuse</a> (no)
 Try to make multiple deliveries per TLS-encrypted connection.

 Available in Postfix version 3.7 and later:

 <a href="postconf.5.html#smtp_per_request_deadline">smtp_per_request_deadline</a> (no)
 Change the behavior of the smtp_*_timeout time limits, from a
 time limit per plaintext or TLS read or write call, to a com-
 bined time limit for sending a complete SMTP request and for
 receiving a complete SMTP response.

 <b#smtp_min_data_rate">mtp_min_data_rate/a> (00</>
 The minimum plaintext data transfer rate in bytes/second for
 DATA requests, when deadlines are enabled with
 <a href="postconf.5.html#java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 25

 Implemented in the <a href="qmgr.8.html">qmgr(8)< java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28

cy_limit></a(< "ostconf.html">default_destination_concur></>
 <a href="postconf.5.html#default_destination_concurrency_limit">rency_limit</a>)
 A transport-specific override for the <a href="postconf.5.html#default_destination_concurrency_limit">default_destination_con</a>-
 <a href="postconf.5.html#default_destination_concurrency_limit">currency_limit</a> parameter value, where transport is the <a href="master.5.html">master.cf</a>
 name of the message java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 30

 <a href="postconf.5.html#transport_destination_recipient_limit">transport_destination_recipient_limit</a> ($
 <a href="postconf.5.html#default_destination_recipient_limit">ent_limit</a>)
 A transport-specific override for the <a href="postconf.5.html#default_destination_recipient_limit">default_destination_recip</a>-
 <a href="postconf.5.html#default_destination_recipient_limit">ient_limit</a> parameter value, where transport is the <a href="master.5.html">master.cf</java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 53

<a name="smtputf8_controls">SMTPUTF8 CONTROLS</a>
 Preliminary SMTPUTF8 support is introduced with Postfix 3.0.

 <a href="postconf.5.html#smtputf8_enable">smtputf8_enable</a> (yes) *
 Enable preliminary SMTPUTF8 support for the protocols described
 in <a href="https://tools.ietf.org/html/rfc6531">RFC 6531</a>, <a href="https://tools The basic lookup is a triple-stage compact array (trie) lookup.

 <a href="postconf.5.html#smtputf8_autodetect_classes">smtputf8_autodetect_classes</a> * For details see beginningof this .
 Detect that a message requires SMTPUTF8 support for the speci-
 fied mail origin classes.

 Available in Postfix version 3.2 and later:

 <a href="postconf.5.html#enable_idna2003_compatibility">enable_idna2003_compatibility</a> (no)
 Enable '* Single-byte codepagesare handled with a different data structure
 IDNA2008, when converting UTF-8 domain names to/from the ASCII
 that .

<a name="trouble_shooting_controls">TROUBLE SHOOTING CONTROLS</a>
 <a href="postconf.5.html#debug_peer_level">debug_peer_level</a> (2)
 The increment in verbose logging level when a nexthop destina-
 tion, remote client or server name or network address matches a
 pattern with a ="ostconf5html#debug_peer_list">debug_peer_list</a> parameter.

 <a href="postconf.5.html#debug_peer_list">debug_peer_list</a> (empty)
 java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 78
 name or network address patterns that, if matched, cause the
 to
 $<a href="postconf.5.html#debug_peer_level">debug_peer_level</a>.

 <a href="postconf.5.html#error_notice_recipient">error_notice_recipient</a> *forthatpointer, while bits31..16 are for which of
 The recipient of postmaster notifications about mail delivery
 problems that are caused *the 16charactersinthe block roundtrip.
 col errors.

 <a href="postconf.5.html#internal_mail_filter_classes">internal_mail_filter_classes</a> (empty)
 What categories of Postfix-generated mail are subject to
 before-queue content inspection by <a href="postconf.5.html#non_smtpd_milters">non_smtpd_milters</a>,
 a =".tml#header_checks">header_checksa and< href="ostconf..#ody_checks"body_checks</a>java.lang.StringIndexOutOfBoundsException: Index 130 out of bounds for length 130

 <a href="postconf.5.html#notify_classes">notify_classes</a> (resource, software)
 he of error classesthat are reported the postmaster.

<a name="miscellaneous_controls">MISCELLANEOUS CONTROLS</a>
 <a href="postconf.5.html#best_mx_transport">best_mx_transport</a> (empty)
 Where the Postfix SMTP client should deliver mail when it
 detects EUCjava.lang.StringIndexOutOfBoundsException: Range [37, 36) out of bounds for length 83

 <a href="*byte longest java.lang.StringIndexOutOfBoundsException: Range [46, 45) out of bounds for length 79
 The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="java.lang.StringIndexOutOfBoundsException: Index 108 out of bounds for length 84
 figuration files.

 <a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)
 much a to java.lang.StringIndexOutOfBoundsException: Range [78, 79) out of bounds for length 78
 request before * stores one b fewer per the maximum of

 .5.htmldelay_logging_resolution_limit">delay_logging_resolution_limit</a> (2)
 The maximal number of digits after the decimal point when log-
 ging delay values.

 <
 Disable DNS lookups in the Postfix SMTP and LMTP clients.

 <a href="postconf.5.html#inet_interfaces">inet_interfaces</a> (all)
 The local network interface addresses that this mail system
 receives mail on.

 <a href="postconf.5.html#inet_protocols">inet_protocols</a> (see 'postconf -d' output)
 The Internet protocols Postfix will attempt to use when making
 or accepting connections.

 <a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)
 The time limit for sending or receiving information over an
 internal communication channel.

 <a href="postconf.5.html#lmtp_assume_final">lmtp_assume_final</a> (no)
 When a remote LMTP server announces no DSN support, assume that
 the server performs final delivery, and send "delivered" deliv-
 ery status notifications instead of "relayed".

 <a href="postconf.5.html#lmtp_tcp_port">lmtp_tcp_port</a> (24)
 The default TCP port that the Postfix LMTP client connects to.

 <valueMBCS_VALUE_2_FROM_STAGE_2,stage2Entry;
 The maximum amount of time that an idle Postfix daemon process
 waits for an incoming connection beforeifvalue=xff){

 <a href="postconf.5.html#max_use">max_use</a> (100)
 The maximal number of incoming connections that a Postfix daemon
 process will service before terminating voluntarily.

 <a href="postconf.5.html#process_id">process_id</a> (read-only)
 The process ID of a Postfix command or daemon process.

 <a href="postconf.5.html#process_name">process_name</a> (read-only)
 The process name of a Postfix command or daemon process.

 <a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a> (empty)
 The remote network interface addresses that this mail system
 receives mail on by way of a proxy or network address transla-
 tion unit.

 <>ahref=postconf5hsmtp_address_preference"smtp_address_preferencea> (ny)/>
 The address type ("ipv6", "ipv4" or "any") that the Postfix SMTP
 client will try first, when a destination has IPv6 and IPv4
 addresses * Savetheold the converter

 <a href="postconf.5.html#smtp_bind_address">smtp_bind_address</a> (empty)
ional address SMTP
 client should bind to when making an IPv4 connection.

 <">smtp_bind_address6</a> (mpty)/b>
 An optional numerical network address that the Postfix SMTP
 client should bind to when making an IPv6 connection.

 <a href="postconf.5.html#smtp_helo_name">smtp_helo_name</a> ($<a href="postconf.5.html#myhostname">myhostname</ state for character output.
 The hostname to send in the SMTP HELO or EHLO command However, the callback still restore the state from the converter

 <a href="postconf.5.html#lmtp_lhlo_name">lmtp_lhlo_name</a> ($<a href="postconf.5.html#myhostname">myhostname</a>)
 The hostname to send in the LMTP LHLO command.

 <a href="postconf.5.html#smtp_host_lookup">smtp_host_lookup</a> (dns)
 What mechanisms the Postfix SMTP client uses to look up a host's
 IP address.

 <a href="postconf.5.html#smtp_randomize_addresses">smtp_randomize_addresses</a> (yes)
 Randomize orderof equalpreference MX host addresses.

 <a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)
 The syslog facility of Postfix logging.

 <a href=" =MBCS_VALUE_2_FROM_STAGE_2(bytes, c);
 A prefix that is prepended to the process name in syslog
 records, so that, for example, "smtpd" becomes "prefix/smtpd".

 Available with Postfix 2.2 and earlier:

 <a href="postconf.5.html#fallback_relay">fallback_relay</a> (empty)
 Optional/*no ,leave= /
 found or that are unreachable.

 Available with Postfix 2.3 and later:

 <a href="postconf.5.html#smtp_fallback_relay">smtp_fallback_relay</a> ( } else (revLength=){
 Optional list of relay destinations that will be used when an
 SMTP destination is not found, or when delivery java.lang.StringIndexOutOfBoundsException: Index 66 out of bounds for length 37
 non-permanent error.

 Available with Postfix 3.0 and later:

 <a href="postconf.5.html#smtp_address_verify_target">smtp_address_verify_target</a> (rcpt)
 In the context of email address verification, the SMTP protocol
 stage that determines whether an email address is deliverable.

 Available with Postfix 3.1 and later:

 <a href="postconf.5.html#java.lang.StringIndexOutOfBoundsException: Range [0, 54) out of bounds for length 43
 Optional list of relay hosts for LMTP destinations that } else if (siLength == 2) {
 found or that are unreachable.

 Available with Postfix 3.2 and later:

 <java.lang.StringIndexOutOfBoundsException: Range [48, 9) out of bounds for length 78
 The default TCP port that the Postfix SMTP client connects to.

 Available inPostfix 3. and later:

 <a href="postconf.5.html#service_name">service_name</a> (read-only)
 The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process.

 Available in Postfix 3.7 and later:

 <a href="postconf =1;
 Defer delivery when the Postfix SMTP client cannot apply }
 <a href="postconf.5.html#smtp_bind_address">smtp_bind_address</a> or <a href="postconf.5.html#smtp_bind_address6">smtp_bind_address6</a> setting.

<a name="see_also">SEE ALSO</a>
 <a (=2
 <a href="header_checks.5.html">header_checks(5)</a>, message header content inspection
 <a href="header_checks.5.html">body_checks(5)</a>, body parts content inspection
 <a href="qmgr.8.html">qmgr(8)</a>, queue manager
 <a href="bounce.8.html">bounce(8)</a>, delivery status reports
 <a href="scache.8.html">scache(8)</a>, connection cache server
 <a href="postconf.5.html">postconf(5)</a>, configuration parameters
 </a>, generic daemon options
 <a href="master.8.html">master(8)</a>, process manager
 <a href="tlsmgr.8.html">tlsmgr(8)</a>, TLS session and PRNG management
 <a href="postlogd.8.html">postlogd(8)</a>, Postfix value|=(uint32_t)soBytes[1]<<16
 syslogd(8), system logging

< FILES<a/b>
 <a href="SASL_README.html">SASL_README</a>, Postfix SASL howto
 <a href="TLS_README.html">TLS_README</a>, Postfix STARTTLS howto

<a name="license">LICENSE</a>
 The Secure Mailer license must be distributed with this software.

AUTHOR(S)
 java.lang.StringIndexOutOfBoundsException: Range [28, 9) out of bounds for length 41
 IBM T.J. Watson Research
 P.O. Box 704
 Yorktown Heights, NY 10598, USA

 Wietse Venema
 Google, Inc.
 111 8th Avenue
 case :

 Command pipelining in cooperation with:
 Jon Ribbens
 Oaktree Internet Solutions Ltd.,
 Internet House,
 Canal Basin,
 Coventry,
 CV1 4LY, United Kingdom.

 SASL support originally byfvaluex){
 Till Franke
 SuSE Rhein/Main AG
 65760 Eschborn, Germany

 TLS support originally by:
 Lutz Jaenicke
 BTU Cottbus
 Allgemeine Elektrotechnik
 Universitaetsplatz 3-4
 D-03044 Cottbus, Germany

 Revised TLS and SMTP connection cache support by:
 Victor Duchovni
 Morgan Stanley

 SMTP(8)
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