/etc/postfix/header_checks - CentOS Linux 6

This is the default example configuration of header_checks provided by Postfix. This config file was generated by Postfix running on CentOS 6.

It is located under: /etc/postfix/header_checks

    # HEADER_CHECKS(5)                                              HEADER_CHECKS(5)
# 
# NAME
#        header_checks - Postfix built-in content inspection
# 
# SYNOPSIS
#        header_checks = pcre:/etc/postfix/header_checks
#        mime_header_checks = pcre:/etc/postfix/mime_header_checks
#        nested_header_checks = pcre:/etc/postfix/nested_header_checks
#        body_checks = pcre:/etc/postfix/body_checks
# 
#        postmap -q "string" pcre:/etc/postfix/filename
#        postmap -q - pcre:/etc/postfix/filename <inputfile
# 
# DESCRIPTION
#        This  document  describes access control on the content of
#        message headers and message body lines; it is  implemented
#        by  the  Postfix  cleanup(8) server before mail is queued.
#        See access(5) for access control  on  remote  SMTP  client
#        information.
# 
#        Each  message  header  or  message  body  line is compared
#        against a list of patterns.  When a  match  is  found  the
#        corresponding action is executed, and the matching process
#        is repeated for the next message header  or  message  body
#        line.
# 
#        For  examples, see the EXAMPLES section at the end of this
#        manual page.
# 
#        Postfix header or body_checks are designed to stop a flood
#        of  mail from worms or viruses; they do not decode attach-
#        ments, and they do not unzip archives. See  the  documents
#        referenced  below  in the README FILES section if you need
#        more sophisticated content analysis.
# 
#        Postfix supports four built-in content inspection classes:
# 
#        header_checks
#               These   are  applied  to  initial  message  headers
#               (except for the headers  that  are  processed  with
#               mime_header_checks).
# 
#        mime_header_checks (default: $header_checks)
#               These  are  applied to MIME related message headers
#               only.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#        nested_header_checks (default: $header_checks)
#               These  are  applied  to message headers of attached
#               email messages (except for  the  headers  that  are
#               processed with mime_header_checks).
# 
#               This feature is available in Postfix 2.0 and later.
# 
#        body_checks
#               These are applied to all other  content,  including
#               multi-part message boundaries.
# 
#               With Postfix versions before 2.0, all content after
#               the initial message headers is treated as body con-
#               tent.
# 
#        Note: message headers are examined one logical header at a
#        time, even when a message  header  spans  multiple  lines.
#        Body lines are always examined one line at a time.
# 
# COMPATIBILITY
#        With Postfix version 2.2 and earlier specify "postmap -fq"
#        to query a table that contains case sensitive patterns. By
#        default,  regexp: and pcre: patterns are case insensitive.
# 
# TABLE FORMAT
#        This document assumes that header  and  body_checks  rules
#        are  specified  in  the form of Postfix regular expression
#        lookup tables. Usually the best  performance  is  obtained
#        with pcre (Perl Compatible Regular Expression) tables, but
#        the slower regexp (POSIX regular expressions)  support  is
#        more  widely  available.  Use the command "postconf -m" to
#        find out what lookup table types your Postfix system  sup-
#        ports.
# 
#        The general format of Postfix regular expression tables is
#        given below.  For a  discussion  of  specific  pattern  or
#        flags   syntax,   see  pcre_table(5)  or  regexp_table(5),
#        respectively.
# 
#        /pattern/flags action
#               When /pattern/ matches the  input  string,  execute
#               the  corresponding  action. See below for a list of
#               possible actions.
# 
#        !/pattern/flags action
#               When /pattern/ does not  match  the  input  string,
#               execute the corresponding action.
# 
#        if /pattern/flags
# 
#        endif  Match the input string against the patterns between
#               if and endif, if and only if the same input  string
#               also matches /pattern/. The if..endif can nest.
# 
#               Note:  do not prepend whitespace to patterns inside
#               if..endif.
# 
#        if !/pattern/flags
# 
#        endif  Match the input string against the patterns between
#               if  and endif, if and only if the same input string
#               does not match /pattern/. The if..endif can nest.
# 
#        blank lines and comments
#               Empty lines and whitespace-only lines are  ignored,
#               as  are  lines whose first non-whitespace character
#               is a `#'.
# 
#        multi-line text
#               A pattern/action line  starts  with  non-whitespace
#               text.  A line that starts with whitespace continues
#               a logical line.
# 
# TABLE SEARCH ORDER
#        For each line of message input, the patterns  are  applied
#        in  the order as specified in the table. When a pattern is
#        found that  matches  the  input  line,  the  corresponding
#        action  is  executed  and  then  the  next  input  line is
#        inspected.
# 
# TEXT SUBSTITUTION
#        Substitution of substrings  from  the  matched  expression
#        into  the action string is possible using the conventional
#        Perl syntax ($1, $2, etc.).   The  macros  in  the  result
#        string  may  need  to  be  written as ${n} or $(n) if they
#        aren't followed by whitespace.
# 
#        Note: since negated patterns (those preceded by !)  return
#        a result when the expression does not match, substitutions
#        are not available for negated patterns.
# 
# ACTIONS
#        Action names are case insensitive. They are shown in upper
#        case for consistency with other Postfix documentation.
# 
#        DISCARD optional text...
#               Claim  successful delivery and silently discard the
#               message.  Log the optional text if specified,  oth-
#               erwise log a generic message.
# 
#               Note:   this  action  disables  further  header  or
#               body_checks inspection of the current  message  and
#               affects all recipients.  To discard only one recip-
#               ient without discarding the entire message, use the
#               transport(5) table to direct mail to the discard(8)
#               service.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#        DUNNO  Pretend  that the input line did not match any pat-
#               tern, and inspect the next input line. This  action
#               can be used to shorten the table search.
# 
#               For  backwards  compatibility reasons, Postfix also
#               accepts OK but it is (and always has been)  treated
#               as DUNNO.
# 
#               This feature is available in Postfix 2.1 and later.
# 
#        FILTER transport:destination
#               Write a content filter request to the  queue  file,
#               and  inspect  the  next input line.  After the com-
#               plete message is received it will be  sent  through
#               the specified external content filter.  More infor-
#               mation about external content  filters  is  in  the
#               Postfix FILTER_README file.
# 
#               Note: this action overrides the content_filter set-
#               ting, and affects all recipients of the message. In
#               the  case  that  multiple FILTER actions fire, only
#               the last one is executed.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#        HOLD optional text...
#               Arrange  for  the  message to be placed on the hold
#               queue, and inspect the next input line.   The  mes-
#               sage  remains  on hold until someone either deletes
#               it or releases it for delivery.  Log  the  optional
#               text if specified, otherwise log a generic message.
# 
#               Mail that is placed on hold can  be  examined  with
#               the  postcat(1)  command,  and  can be destroyed or
#               released with the postsuper(1) command.
# 
#               Note: use "postsuper -r" to release mail  that  was
#               kept  on  hold for a significant fraction of $maxi-
#               mal_queue_lifetime  or  $bounce_queue_lifetime,  or
#               longer.  Use "postsuper -H" only for mail that will
#               not expire within a few delivery attempts.
# 
#               Note: this action affects  all  recipients  of  the
#               message.
# 
#               This feature is available in Postfix 2.0 and later.
# 
#        IGNORE Delete the current line from the input, and inspect
#               the next input line.
# 
#        PREPEND text...
#               Prepend  one  line  with  the  specified  text, and
#               inspect the next input line.
# 
#               Notes:
# 
#               o      The prepended text is output on  a  separate
#                      line,  immediately  before  the  input  that
#                      triggered the PREPEND action.
# 
#               o      The prepended text is not considered part of
#                      the  input  stream:  it  is  not  subject to
#                      header/body checks or address rewriting, and
#                      it does not affect the way that Postfix adds
#                      missing message headers.
# 
#               o      When prepending text before a message header
#                      line,  the  prepended text must begin with a
#                      valid message header label.
# 
#               o      This action cannot be used to prepend multi-
#                      line text.
# 
#               This feature is available in Postfix 2.1 and later.
# 
#        REDIRECT user@domain
#               Write a message redirection request  to  the  queue
#               file,  and  inspect  the next input line. After the
#               message is queued, it will be sent to the specified
#               address instead of the intended recipient(s).
# 
#               Note:  this action overrides the FILTER action, and
#               affects all recipients of the message. If  multiple
#               REDIRECT  actions  fire,  only the last one is exe-
#               cuted.
# 
#               This feature is available in Postfix 2.1 and later.
# 
#        REPLACE text...
#               Replace  the  current line with the specified text,
#               and inspect the next input line.
# 
#               This feature is available in Postfix 2.2 and later.
#               The  description below applies to Postfix 2.2.2 and
#               later.
# 
#               Notes:
# 
#               o      When replacing a message  header  line,  the
#                      replacement  text  must  begin  with a valid
#                      header label.
# 
#               o      The replaced text remains part of the  input
#                      stream.  Unlike  the result from the PREPEND
#                      action, a replaced  message  header  may  be
#                      subject  to address rewriting and may affect
#                      the way that Postfix  adds  missing  message
#                      headers.
# 
#        REJECT optional text...
#               Reject  the  entire  message.  Reply  with optional
#               text... when the optional text is specified, other-
#               wise reply with a generic error message.
# 
#               Note:   this  action  disables  further  header  or
#               body_checks inspection of the current  message  and
#               affects all recipients.
# 
#               Postfix version 2.3 and later support enhanced sta-
#               tus codes.  When no code is specified at the begin-
#               ning of optional text..., Postfix inserts a default
#               enhanced status code of "5.7.1".
# 
#        WARN optional text...
#               Log a warning with the optional text... (or  log  a
#               generic  message), and inspect the next input line.
#               This action is useful for debugging and for testing
#               a pattern before applying more drastic actions.
# 
# BUGS
#        Empty lines never match, because some map types mis-behave
#        when given a zero-length search string.   This  limitation
#        may  be  removed for regular expression tables in a future
#        release.
# 
#        Many people overlook the main limitations  of  header  and
#        body_checks rules.
# 
#        o      These  rules  operate on one logical message header
#               or one body line at a time. A decision made for one
#               line is not carried over to the next line.
# 
#        o      If  text  in the message body is encoded (RFC 2045)
#               then the rules need to be specified for the encoded
#               form.
# 
#        o      Likewise,  when  message  headers  are encoded (RFC
#               2047) then the rules need to be specified  for  the
#               encoded form.
# 
#        Message  headers added by the cleanup(8) daemon itself are
#        excluded from inspection. Examples of such message headers
#        are From:, To:, Message-ID:, Date:.
# 
#        Message  headers  deleted by the cleanup(8) daemon will be
#        examined before they are deleted. Examples are: Bcc:, Con-
#        tent-Length:, Return-Path:.
# 
# CONFIGURATION PARAMETERS
#        body_checks
#               Lookup tables with content filter rules for message
#               body lines.  These filters see one physical line at
#               a  time,  in  chunks  of at most $line_length_limit
#               bytes.
# 
#        body_checks_size_limit
#               The amount of  content  per  message  body  segment
#               (attachment) that is subjected to $body_checks fil-
#               tering.
# 
#        header_checks
# 
#        mime_header_checks (default: $header_checks)
# 
#        nested_header_checks (default: $header_checks)
#               Lookup tables with content filter rules for message
#               header  lines:  respectively,  these are applied to
#               the initial message  headers  (not  including  MIME
#               headers),  to the MIME headers anywhere in the mes-
#               sage, and to the initial headers of  attached  mes-
#               sages.
# 
#               Note:  these filters see one logical message header
#               at a time, even when a message header spans  multi-
#               ple  lines.  Message  headers  that are longer than
#               $header_size_limit characters are truncated.
# 
#        disable_mime_input_processing
#               While receiving mail, give no special treatment  to
#               MIME  related  message  headers; all text after the
#               initial message headers is considered to be part of
#               the  message body. This means that header_checks is
#               applied to all the  initial  message  headers,  and
#               that body_checks is applied to the remainder of the
#               message.
# 
#               Note: when used in this  manner,  body_checks  will
#               process  a  multi-line message header one line at a
#               time.
# 
# EXAMPLES
#        Header pattern to block attachments  with  bad  file  name
#        extensions.   For  convenience, the PCRE /x flag is speci-
#        fied, so that there is no need  to  collapse  the  pattern
#        into   a   single  line  of  text.   The  purpose  of  the
#        [[:xdigit:]] sub-expressions is to recognize Windows CLSID
#        strings.
# 
#        /etc/postfix/main.cf:
#            header_checks = pcre:/etc/postfix/header_checks.pcre
# 
#        /etc/postfix/header_checks.pcre:
#            /^Content-(Disposition|Type).*name\s*=\s*"?(.*(\.|=2E)(
#              ade|adp|asp|bas|bat|chm|cmd|com|cpl|crt|dll|exe|
#              hlp|ht[at]|
#              inf|ins|isp|jse?|lnk|md[betw]|ms[cipt]|nws|
#              \{[[:xdigit:]]{8}(?:-[[:xdigit:]]{4}){3}-[[:xdigit:]]{12}\}|
#              ops|pcd|pif|prf|reg|sc[frt]|sh[bsm]|swf|
#              vb[esx]?|vxd|ws[cfh]))(\?=)?"?\s*(;|$)/x
#                REJECT Attachment name "$2" may not end with ".$4"
# 
#        Body pattern to stop a specific HTML browser vulnerability
#        exploit.
# 
#        /etc/postfix/main.cf:
#            body_checks = regexp:/etc/postfix/body_checks
# 
#        /etc/postfix/body_checks:
#            /^<iframe src=(3D)?cid:.* height=(3D)?0 width=(3D)?0>$/
#                REJECT IFRAME vulnerability exploit
# 
# SEE ALSO
#        cleanup(8), canonicalize and enqueue Postfix message
#        pcre_table(5), format of PCRE lookup tables
#        regexp_table(5), format of POSIX regular expression tables
#        postconf(1), Postfix configuration utility
#        postmap(1), Postfix lookup table management
#        postsuper(1), Postfix janitor
#        postcat(1), show Postfix queue file contents
#        RFC 2045, base64 and quoted-printable encoding rules
#        RFC 2047, message header encoding for non-ASCII text
# 
# README FILES
#        Use "postconf readme_directory" or  "postconf  html_direc-
#        tory" to locate this information.
#        DATABASE_README, Postfix lookup table overview
#        CONTENT_INSPECTION_README, Postfix content inspection overview
#        BUILTIN_FILTER_README, Postfix built-in content inspection
#        BACKSCATTER_README, blocking returned forged mail
# 
# LICENSE
#        The  Secure  Mailer  license must be distributed with this
#        software.
# 
# AUTHOR(S)
#        Wietse Venema
#        IBM T.J. Watson Research
#        P.O. Box 704
#        Yorktown Heights, NY 10598, USA
# 
#                                                               HEADER_CHECKS(5)

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