debian/debconf/conf.d/acl/40_exim4-config_check_data

   1
   2 ### acl/40_exim4-config_check_data
   3 #################################
   4
   5 # This ACL is used after the contents of a message have been received. This
   6 # is the ACL in which you can test a message's headers or body, and in
   7 # particular, this is where you can invoke external virus or spam scanners.
   8
   9 acl_check_data:
  10
  11   # Deny if the message contains an overlong line.  Per the standards
  12   # we should never receive one such via SMTP.
  13   #
  14   .ifndef IGNORE_SMTP_LINE_LENGTH_LIMIT
  15   deny    message    = maximum allowed line length is 998 octets, \
  16                        got $max_received_linelength
  17           condition  = ${if > {$max_received_linelength}{998}}
  18   .endif
  19
  20   # Deny unless the address list headers are syntactically correct.
  21   #
  22   # If you enable this, you might reject legitimate mail.
  23   .ifdef CHECK_DATA_VERIFY_HEADER_SYNTAX
  24   deny
  25     message = Message headers fail syntax check
  26     !acl = acl_local_deny_exceptions
  27     !verify = header_syntax
  28   .endif
  29
  30
  31   # require that there is a verifiable sender address in at least
  32   # one of the "Sender:", "Reply-To:", or "From:" header lines.
  33   .ifdef CHECK_DATA_VERIFY_HEADER_SENDER
  34   deny
  35     message = No verifiable sender address in message headers
  36     !acl = acl_local_deny_exceptions
  37     !verify = header_sender
  38   .endif
  39
  40
  41   # Deny if the message contains malware. Before enabling this check, you
  42   # must install a virus scanner and set the av_scanner option in the
  43   # main configuration.
  44   #
  45   # exim4-daemon-heavy must be used for this section to work.
  46   #
  47   # deny
  48   #   malware = *
  49   #   message = This message was detected as possible malware ($malware_name).
  50
  51
  52   # Add headers to a message if it is judged to be spam. Before enabling this,
  53   # you must install SpamAssassin. You also need to set the spamd_address
  54   # option in the main configuration.
  55   #
  56   # exim4-daemon-heavy must be used for this section to work.
  57   #
  58   # Please note that this is only suiteable as an example. There are
  59   # multiple issues with this configuration method. For example, if you go
  60   # this way, you'll give your spamassassin daemon write access to the
  61   # entire exim spool which might be a security issue in case of a
  62   # spamassassin exploit.
  63   #
  64   # See the exim docs and the exim wiki for more suitable examples.
  65   #
  66   # warn
  67   #   spam = Debian-exim:true
  68   #   add_header = X-Spam_score: $spam_score\n\
  69   #             X-Spam_score_int: $spam_score_int\n\
  70   #             X-Spam_bar: $spam_bar\n\
  71   #             X-Spam_report: $spam_report
  72
  73
  74   # This hook allows you to hook in your own ACLs without having to
  75   # modify this file. If you do it like we suggest, you'll end up with
  76   # a small performance penalty since there is an additional file being
  77   # accessed. This doesn't happen if you leave the macro unset.
  78   .ifdef CHECK_DATA_LOCAL_ACL_FILE
  79   .include CHECK_DATA_LOCAL_ACL_FILE
  80   .endif
  81
  82
  83   # accept otherwise
  84   accept