551 lines
20 KiB
Groff
551 lines
20 KiB
Groff
.TH CLEANUP 8
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.ad
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.fi
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.SH NAME
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cleanup
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\-
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canonicalize and enqueue Postfix message
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.SH "SYNOPSIS"
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.na
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.nf
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\fBcleanup\fR [generic Postfix daemon options]
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.SH DESCRIPTION
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.ad
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.fi
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The \fBcleanup\fR(8) daemon processes inbound mail, inserts it
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into the \fBincoming\fR mail queue, and informs the queue
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manager of its arrival.
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The \fBcleanup\fR(8) daemon performs the following transformations:
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.IP \(bu
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Insert missing message headers: (\fBResent\-\fR) \fBFrom:\fR,
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\fBTo:\fR, \fBMessage\-Id:\fR, and \fBDate:\fR.
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.br
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This is enabled with the \fBlocal_header_rewrite_clients\fR and
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\fBalways_add_missing_headers\fR parameter settings.
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.IP \(bu
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Transform envelope and header addresses to the standard
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\fIuser@fully\-qualified\-domain\fR form that is expected by other
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Postfix programs.
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This task depends on the \fBtrivial\-rewrite\fR(8) daemon.
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.br
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The header transformation is enabled with the
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\fBlocal_header_rewrite_clients\fR parameter setting.
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.IP \(bu
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Eliminate duplicate envelope recipient addresses.
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.br
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This is enabled with the \fBduplicate_filter_limit\fR
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parameter setting.
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.IP \(bu
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Remove message headers: \fBBcc\fR, \fBContent\-Length\fR,
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\fBResent\-Bcc\fR, \fBReturn\-Path\fR.
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.br
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This is enabled with the message_drop_headers parameter
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setting.
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.IP \(bu
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Optionally, rewrite all envelope and header addresses according
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to the mappings specified in the \fBcanonical\fR(5) lookup tables.
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.br
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The header transformation is enabled with the
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\fBlocal_header_rewrite_clients\fR parameter setting.
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.IP \(bu
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Optionally, masquerade envelope sender addresses and message
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header addresses (i.e. strip host or domain information below
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all domains listed in the \fBmasquerade_domains\fR parameter,
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except for user names listed in \fBmasquerade_exceptions\fR).
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By default, address masquerading does not affect envelope recipients.
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.br
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The header transformation is enabled with the
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\fBlocal_header_rewrite_clients\fR parameter setting.
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.IP \(bu
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Optionally, expand envelope recipients according to information
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found in the \fBvirtual_alias_maps\fR lookup tables.
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.PP
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The \fBcleanup\fR(8) daemon performs sanity checks on the content of
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each message. When it finds a problem, by default it returns a
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diagnostic status to the cleanup service client, and leaves
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it up to the client
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to deal with the problem. Alternatively, the client can request
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the \fBcleanup\fR(8) daemon to bounce the message back to the sender
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in case of trouble.
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.SH "STANDARDS"
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.na
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.nf
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RFC 822 (ARPA Internet Text Messages)
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RFC 2045 (MIME: Format of Internet Message Bodies)
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RFC 2046 (MIME: Media Types)
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RFC 2822 (Internet Message Format)
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RFC 3463 (Enhanced Status Codes)
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RFC 3464 (Delivery status notifications)
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RFC 5322 (Internet Message Format)
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RFC 8689 (TLS\-Required: message header)
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.SH DIAGNOSTICS
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.ad
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.fi
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Problems and transactions are logged to \fBsyslogd\fR(8)
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or \fBpostlogd\fR(8).
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.SH BUGS
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.ad
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.fi
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Table\-driven rewriting rules make it hard to express \fBif then
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else\fR and other logical relationships.
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.SH "CONFIGURATION PARAMETERS"
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.na
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.nf
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.ad
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.fi
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Changes to \fBmain.cf\fR are picked up automatically, as
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\fBcleanup\fR(8)
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processes run for only a limited amount of time. Use the command
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"\fBpostfix reload\fR" to speed up a change.
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The text below provides only a parameter summary. See
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\fBpostconf\fR(5) for more details including examples.
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.SH "COMPATIBILITY CONTROLS"
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.na
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.nf
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.ad
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.fi
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.IP "\fBundisclosed_recipients_header (see 'postconf -d' output)\fR"
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Message header that the Postfix \fBcleanup\fR(8) server inserts when a
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message contains no To: or Cc: message header.
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.PP
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Available in Postfix version 2.1 only:
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.IP "\fBenable_errors_to (no)\fR"
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Report mail delivery errors to the address specified with the
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non\-standard Errors\-To: message header, instead of the envelope
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sender address (this feature is removed with Postfix version 2.2, is
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turned off by default with Postfix version 2.1, and is always turned on
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with older Postfix versions).
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.PP
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Available in Postfix version 2.6 and later:
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.IP "\fBalways_add_missing_headers (no)\fR"
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Always add (Resent\-) From:, To:, Date: or Message\-ID: headers
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when not present.
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.PP
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Available in Postfix version 2.9 and later:
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.IP "\fBenable_long_queue_ids (no)\fR"
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Enable long, non\-repeating, queue IDs (queue file names).
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.SH "HEADER FORMATTING CONTROLS"
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.na
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.nf
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.ad
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.fi
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.PP
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Available in Postfix version 3.0 and later:
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.IP "\fBmessage_drop_headers (bcc, content\-length, resent\-bcc, return\-path)\fR"
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Names of message headers that the \fBcleanup\fR(8) daemon will remove
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after applying \fBheader_checks\fR(5) and before invoking Milter applications.
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.PP
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Available in Postfix version 3.3 and later:
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.IP "\fBheader_from_format (standard)\fR"
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The format of the Postfix\-generated \fBFrom:\fR header.
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.PP
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Available in Postfix version 3.10 and later:
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.IP "\fBfull_name_encoding_charset (utf\-8)\fR"
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The character set name (also called "charset") that Postfix
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will output when it automatically generates an RFC 2047 encoded
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full name.
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.SH "BUILT-IN CONTENT FILTERING CONTROLS"
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.na
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.nf
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.ad
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.fi
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Postfix built\-in content filtering is meant to stop a flood of
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worms or viruses. It is not a general content filter.
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.IP "\fBbody_checks (empty)\fR"
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Optional lookup tables for content inspection as specified in
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the \fBbody_checks\fR(5) manual page.
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.IP "\fBheader_checks (empty)\fR"
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Optional lookup tables for content inspection of primary non\-MIME
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message headers, as specified in the \fBheader_checks\fR(5) manual page.
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.PP
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Available in Postfix version 2.0 and later:
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.IP "\fBbody_checks_size_limit (51200)\fR"
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How much text in a message body segment (or attachment, if you
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prefer to use that term) is subjected to body_checks inspection.
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.IP "\fBmime_header_checks ($header_checks)\fR"
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Optional lookup tables for content inspection of MIME related
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message headers, as described in the \fBheader_checks\fR(5) manual page.
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.IP "\fBnested_header_checks ($header_checks)\fR"
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Optional lookup tables for content inspection of non\-MIME message
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headers in attached messages, as described in the \fBheader_checks\fR(5)
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manual page.
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.PP
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Available in Postfix version 2.3 and later:
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.IP "\fBmessage_reject_characters (empty)\fR"
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The set of characters that Postfix will reject in message
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content.
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.IP "\fBmessage_strip_characters (empty)\fR"
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The set of characters that Postfix will remove from message
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content.
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.PP
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Available in Postfix version 3.9, 3.8.5, 3.7.10, 3.6.14,
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3.5.24, and later:
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.IP "\fBcleanup_replace_stray_cr_lf (yes)\fR"
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Replace each stray <CR> or <LF> character in message
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content with a space character, to prevent outbound SMTP smuggling,
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and to make the evaluation of Postfix\-added DKIM or other signatures
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independent from how a remote mail server handles such characters.
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.SH "BEFORE QUEUE MILTER CONTROLS"
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.na
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.nf
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.ad
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.fi
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As of version 2.3, Postfix supports the Sendmail version 8
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Milter (mail filter) protocol. When mail is not received via
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the smtpd(8) server, the cleanup(8) server will simulate
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SMTP events to the extent that this is possible. For details
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see the MILTER_README document.
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.IP "\fBnon_smtpd_milters (empty)\fR"
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A list of Milter (mail filter) applications for new mail that
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does not arrive via the Postfix \fBsmtpd\fR(8) server.
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.IP "\fBmilter_protocol (6)\fR"
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The mail filter protocol version and optional protocol extensions
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for communication with a Milter application; prior to Postfix 2.6
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the default protocol is 2.
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.IP "\fBmilter_default_action (tempfail)\fR"
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The default action when a Milter (mail filter) response is
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unavailable (for example, bad Postfix configuration or Milter
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failure).
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.IP "\fBmilter_macro_daemon_name ($myhostname)\fR"
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The {daemon_name} macro value for Milter (mail filter) applications.
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.IP "\fBmilter_macro_v ($mail_name $mail_version)\fR"
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The {v} macro value for Milter (mail filter) applications.
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.IP "\fBmilter_connect_timeout (30s)\fR"
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The time limit for connecting to a Milter (mail filter)
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application, and for negotiating protocol options.
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.IP "\fBmilter_command_timeout (30s)\fR"
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The time limit for sending an SMTP command to a Milter (mail
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filter) application, and for receiving the response.
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.IP "\fBmilter_content_timeout (300s)\fR"
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The time limit for sending message content to a Milter (mail
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filter) application, and for receiving the response.
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.IP "\fBmilter_connect_macros (see 'postconf -d' output)\fR"
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The macros that are sent to Milter (mail filter) applications
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after completion of an SMTP connection.
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.IP "\fBmilter_helo_macros (see 'postconf -d' output)\fR"
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The macros that are sent to Milter (mail filter) applications
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after the SMTP HELO or EHLO command.
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.IP "\fBmilter_mail_macros (see 'postconf -d' output)\fR"
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The macros that are sent to Milter (mail filter) applications
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after the SMTP MAIL FROM command.
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.IP "\fBmilter_rcpt_macros (see 'postconf -d' output)\fR"
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The macros that are sent to Milter (mail filter) applications
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after the SMTP RCPT TO command.
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.IP "\fBmilter_data_macros (see 'postconf -d' output)\fR"
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The macros that are sent to version 4 or higher Milter (mail
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filter) applications after the SMTP DATA command.
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.IP "\fBmilter_unknown_command_macros (see 'postconf -d' output)\fR"
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The macros that are sent to version 3 or higher Milter (mail
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filter) applications after an unknown SMTP command.
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.IP "\fBmilter_end_of_data_macros (see 'postconf -d' output)\fR"
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The macros that are sent to Milter (mail filter) applications
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after the message end\-of\-data.
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.PP
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Available in Postfix version 2.5 and later:
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.IP "\fBmilter_end_of_header_macros (see 'postconf -d' output)\fR"
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The macros that are sent to Milter (mail filter) applications
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after the end of the message header.
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.PP
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Available in Postfix version 2.7 and later:
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.IP "\fBmilter_header_checks (empty)\fR"
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Optional lookup tables for content inspection of message headers
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that are produced by Milter applications.
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.PP
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Available in Postfix version 3.1 and later:
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.IP "\fBmilter_macro_defaults (empty)\fR"
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Optional list of \fIname=value\fR pairs that specify default
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values for arbitrary macros that Postfix may send to Milter
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applications.
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.SH "MIME PROCESSING CONTROLS"
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.na
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.nf
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.ad
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.fi
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Available in Postfix version 2.0 and later:
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.IP "\fBdisable_mime_input_processing (no)\fR"
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Turn off MIME processing while receiving mail.
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.IP "\fBmime_boundary_length_limit (2048)\fR"
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The maximal length of MIME multipart boundary strings.
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.IP "\fBmime_nesting_limit (100)\fR"
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The maximal recursion level that the MIME processor will handle.
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.IP "\fBstrict_8bitmime (no)\fR"
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Enable both strict_7bit_headers and strict_8bitmime_body.
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.IP "\fBstrict_7bit_headers (no)\fR"
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Reject mail with 8\-bit text in message headers.
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.IP "\fBstrict_8bitmime_body (no)\fR"
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Reject 8\-bit message body text without 8\-bit MIME content encoding
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information.
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.IP "\fBstrict_mime_encoding_domain (no)\fR"
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Reject mail with invalid Content\-Transfer\-Encoding: information
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for the message/* or multipart/* MIME content types.
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.PP
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Available in Postfix version 2.5 and later:
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.IP "\fBdetect_8bit_encoding_header (yes)\fR"
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Automatically detect 8BITMIME body content by looking at
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Content\-Transfer\-Encoding: message headers; historically, this
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behavior was hard\-coded to be "always on".
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.SH "AUTOMATIC BCC RECIPIENT CONTROLS"
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.na
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.nf
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.ad
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.fi
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Postfix can automatically add BCC (blind carbon copy)
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when mail enters the mail system:
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.IP "\fBalways_bcc (empty)\fR"
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Optional address that receives a "blind carbon copy" of each message
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that is received by the Postfix mail system.
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.PP
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Available in Postfix version 2.1 and later:
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.IP "\fBsender_bcc_maps (empty)\fR"
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Optional BCC (blind carbon\-copy) address lookup tables, indexed
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by envelope sender address.
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.IP "\fBrecipient_bcc_maps (empty)\fR"
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Optional BCC (blind carbon\-copy) address lookup tables, indexed by
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envelope recipient address.
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.SH "ADDRESS TRANSFORMATION CONTROLS"
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.na
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.nf
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.ad
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.fi
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Address rewriting is delegated to the \fBtrivial\-rewrite\fR(8) daemon.
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The \fBcleanup\fR(8) server implements table driven address mapping.
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.IP "\fBempty_address_recipient (MAILER\-DAEMON)\fR"
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The recipient of mail addressed to the null address.
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.IP "\fBcanonical_maps (empty)\fR"
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Optional address mapping lookup tables for message headers and
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envelopes.
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.IP "\fBrecipient_canonical_maps (empty)\fR"
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Optional address mapping lookup tables for envelope and header
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recipient addresses.
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.IP "\fBsender_canonical_maps (empty)\fR"
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Optional address mapping lookup tables for envelope and header
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sender addresses.
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.IP "\fBmasquerade_classes (envelope_sender, header_sender, header_recipient)\fR"
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What addresses are subject to address masquerading.
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.IP "\fBmasquerade_domains (empty)\fR"
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Optional list of domains whose subdomain structure will be stripped
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off in email addresses.
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.IP "\fBmasquerade_exceptions (empty)\fR"
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Optional list of user names that are not subjected to address
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masquerading, even when their addresses match $masquerade_domains.
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.IP "\fBpropagate_unmatched_extensions (canonical, virtual)\fR"
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What address lookup tables copy an address extension from the lookup
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key to the lookup result.
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.PP
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Available before Postfix version 2.0:
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.IP "\fBvirtual_maps (empty)\fR"
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Optional lookup tables with a) names of domains for which all
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addresses are aliased to addresses in other local or remote domains,
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and b) addresses that are aliased to addresses in other local or
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remote domains.
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.PP
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Available in Postfix version 2.0 and later:
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.IP "\fBvirtual_alias_maps ($virtual_maps)\fR"
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Optional lookup tables that are often searched with a full email
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address (including domain) and that apply to all recipients: \fBlocal\fR(8),
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virtual, and remote; this is unlike alias_maps that are only searched
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with an email address localpart (no domain) and that apply
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only to \fBlocal\fR(8) recipients.
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.PP
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Available in Postfix version 2.2 and later:
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.IP "\fBcanonical_classes (envelope_sender, envelope_recipient, header_sender, header_recipient)\fR"
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What addresses are subject to canonical_maps address mapping.
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.IP "\fBrecipient_canonical_classes (envelope_recipient, header_recipient)\fR"
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What addresses are subject to recipient_canonical_maps address
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mapping.
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.IP "\fBsender_canonical_classes (envelope_sender, header_sender)\fR"
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What addresses are subject to sender_canonical_maps address
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mapping.
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.IP "\fBremote_header_rewrite_domain (empty)\fR"
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Rewrite or add message headers in mail from remote clients if
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the remote_header_rewrite_domain parameter value is non\-empty,
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updating incomplete addresses with the domain specified in the
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remote_header_rewrite_domain parameter, and adding missing headers.
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.SH "RESOURCE AND RATE CONTROLS"
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.na
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.nf
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.ad
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.fi
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.IP "\fBduplicate_filter_limit (1000)\fR"
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The maximal number of addresses remembered by the address
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duplicate filter for \fBaliases\fR(5) or \fBvirtual\fR(5) alias expansion, or
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for \fBshowq\fR(8) queue displays.
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.IP "\fBheader_size_limit (102400)\fR"
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The maximal amount of memory in bytes for storing a message header.
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.IP "\fBhopcount_limit (50)\fR"
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The maximal number of Received: message headers that is allowed
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in the primary message headers.
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.IP "\fBin_flow_delay (1s)\fR"
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Time to pause before accepting a new message, when the message
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arrival rate exceeds the message delivery rate.
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.IP "\fBmessage_size_limit (10240000)\fR"
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The maximal size in bytes of a message, including envelope information.
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.PP
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Available in Postfix version 2.0 and later:
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.IP "\fBheader_address_token_limit (10240)\fR"
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The maximal number of address tokens are allowed in an address
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message header.
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.IP "\fBmime_boundary_length_limit (2048)\fR"
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The maximal length of MIME multipart boundary strings.
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.IP "\fBmime_nesting_limit (100)\fR"
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The maximal recursion level that the MIME processor will handle.
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.IP "\fBqueue_file_attribute_count_limit (100)\fR"
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The maximal number of (name=value) attributes that may be stored
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in a Postfix queue file.
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.PP
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Available in Postfix version 2.1 and later:
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.IP "\fBvirtual_alias_expansion_limit (1000)\fR"
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The maximal number of addresses that virtual alias expansion produces
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from each original recipient.
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.IP "\fBvirtual_alias_recursion_limit (1000)\fR"
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The maximal nesting depth of virtual alias expansion.
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.PP
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Available in Postfix version 3.0 and later:
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.IP "\fBvirtual_alias_address_length_limit (1000)\fR"
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The maximal length of an email address after virtual alias expansion.
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.SH "SMTPUTF8 CONTROLS"
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.na
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.nf
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.ad
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.fi
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Preliminary SMTPUTF8 support is introduced with Postfix 3.0.
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.IP "\fBsmtputf8_enable (yes)\fR"
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Enable preliminary SMTPUTF8 support for the protocols described
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in RFC 6531, RFC 6532, and RFC 6533.
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.IP "\fBsmtputf8_autodetect_classes (sendmail, verify)\fR"
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Detect that a message requires SMTPUTF8 support for the specified
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mail origin classes.
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.PP
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Available in Postfix version 3.2 and later:
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.IP "\fBenable_idna2003_compatibility (no)\fR"
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Enable 'transitional' compatibility between IDNA2003 and IDNA2008,
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when converting UTF\-8 domain names to/from the ASCII form that is
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used for DNS lookups.
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.SH "TLS SUPPORT"
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.na
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.nf
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.ad
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.fi
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Available in Postfix version 3.10 and later:
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.IP "\fBtls_required_enable (yes)\fR"
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Enable support for the "TLS\-Required: no" message header, defined
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in RFC 8689.
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.SH "MISCELLANEOUS CONTROLS"
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.na
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.nf
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.ad
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.fi
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.IP "\fBconfig_directory (see 'postconf -d' output)\fR"
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The default location of the Postfix main.cf and master.cf
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configuration files.
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.IP "\fBdaemon_timeout (18000s)\fR"
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How much time a Postfix daemon process may take to handle a
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request before it is terminated by a built\-in watchdog timer.
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.IP "\fBdelay_logging_resolution_limit (2)\fR"
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The maximal number of digits after the decimal point when logging
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delay values.
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.IP "\fBdelay_warning_time (0h)\fR"
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The time after which the sender receives a copy of the message
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headers of mail that is still queued.
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.IP "\fBipc_timeout (3600s)\fR"
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The time limit for sending or receiving information over an internal
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communication channel.
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.IP "\fBmax_idle (100s)\fR"
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The maximum amount of time that an idle Postfix daemon process waits
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for an incoming connection before terminating voluntarily.
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.IP "\fBmax_use (100)\fR"
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The maximal number of incoming connections that a Postfix daemon
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process will service before terminating voluntarily.
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.IP "\fBmyhostname (see 'postconf -d' output)\fR"
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The internet hostname of this mail system.
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.IP "\fBmyorigin ($myhostname)\fR"
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The domain name that locally\-posted mail appears to come
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from, and that locally posted mail is delivered to.
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.IP "\fBprocess_id (read\-only)\fR"
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The process ID of a Postfix command or daemon process.
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.IP "\fBprocess_name (read\-only)\fR"
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The process name of a Postfix command or daemon process.
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.IP "\fBqueue_directory (see 'postconf -d' output)\fR"
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The location of the Postfix top\-level queue directory.
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.IP "\fBsoft_bounce (no)\fR"
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Safety net to keep mail queued that would otherwise be returned to
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the sender.
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.IP "\fBsyslog_facility (mail)\fR"
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The syslog facility of Postfix logging.
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.IP "\fBsyslog_name (see 'postconf -d' output)\fR"
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A prefix that is prepended to the process name in syslog
|
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records, so that, for example, "smtpd" becomes "prefix/smtpd".
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.PP
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Available in Postfix version 2.1 and later:
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.IP "\fBenable_original_recipient (yes)\fR"
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|
Enable support for the original recipient address after an
|
|
address is rewritten to a different address (for example with
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aliasing or with canonical mapping).
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.PP
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Available in Postfix 3.3 and later:
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.IP "\fBservice_name (read\-only)\fR"
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The master.cf service name of a Postfix daemon process.
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.PP
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Available in Postfix 3.5 and later:
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.IP "\fBinfo_log_address_format (external)\fR"
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|
The email address form that will be used in non\-debug logging
|
|
(info, warning, etc.).
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.PP
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Available in Postfix 3.9 and later:
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.IP "\fBforce_mime_input_conversion (no)\fR"
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Convert body content that claims to be 8\-bit into quoted\-printable,
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|
before header_checks, body_checks, Milters, and before after\-queue
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content filters.
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.SH "FILES"
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.na
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|
.nf
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|
/etc/postfix/canonical*, canonical mapping table
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/etc/postfix/virtual*, virtual mapping table
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.SH "SEE ALSO"
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.na
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.nf
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|
trivial\-rewrite(8), address rewriting
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qmgr(8), queue manager
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header_checks(5), message header content inspection
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body_checks(5), body parts content inspection
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canonical(5), canonical address lookup table format
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virtual(5), virtual alias lookup table format
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postconf(5), configuration parameters
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master(5), generic daemon options
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master(8), process manager
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postlogd(8), Postfix logging
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syslogd(8), system logging
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.SH "README FILES"
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.na
|
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.nf
|
|
.ad
|
|
.fi
|
|
Use "\fBpostconf readme_directory\fR" or
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|
"\fBpostconf html_directory\fR" to locate this information.
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.na
|
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.nf
|
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ADDRESS_REWRITING_README Postfix address manipulation
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CONTENT_INSPECTION_README content inspection
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.SH "LICENSE"
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|
.na
|
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.nf
|
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.ad
|
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.fi
|
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The Secure Mailer license must be distributed with this software.
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.SH "AUTHOR(S)"
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|
.na
|
|
.nf
|
|
Wietse Venema
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IBM T.J. Watson Research
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P.O. Box 704
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Yorktown Heights, NY 10598, USA
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Wietse Venema
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Google, Inc.
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111 8th Avenue
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New York, NY 10011, USA
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Wietse Venema
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porcupine.org
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