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85 lines
2.8 KiB
Plaintext
85 lines
2.8 KiB
Plaintext
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### acl/40_exim4-config_check_data
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#################################
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# This ACL is used after the contents of a message have been received. This
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# is the ACL in which you can test a message's headers or body, and in
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# particular, this is where you can invoke external virus or spam scanners.
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acl_check_data:
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# Deny if the message contains an overlong line. Per the standards
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# we should never receive one such via SMTP.
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#
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.ifndef IGNORE_SMTP_LINE_LENGTH_LIMIT
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deny message = maximum allowed line length is 998 octets, \
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got $max_received_linelength
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condition = ${if > {$max_received_linelength}{998}}
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.endif
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# Deny unless the address list headers are syntactically correct.
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#
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# If you enable this, you might reject legitimate mail.
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.ifdef CHECK_DATA_VERIFY_HEADER_SYNTAX
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deny
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message = Message headers fail syntax check
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!acl = acl_local_deny_exceptions
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!verify = header_syntax
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.endif
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# require that there is a verifiable sender address in at least
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# one of the "Sender:", "Reply-To:", or "From:" header lines.
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.ifdef CHECK_DATA_VERIFY_HEADER_SENDER
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deny
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message = No verifiable sender address in message headers
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!acl = acl_local_deny_exceptions
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!verify = header_sender
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.endif
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# Deny if the message contains malware. Before enabling this check, you
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# must install a virus scanner and set the av_scanner option in the
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# main configuration.
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#
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# exim4-daemon-heavy must be used for this section to work.
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#
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# deny
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# malware = *
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# message = This message was detected as possible malware ($malware_name).
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# Add headers to a message if it is judged to be spam. Before enabling this,
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# you must install SpamAssassin. You also need to set the spamd_address
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# option in the main configuration.
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#
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# exim4-daemon-heavy must be used for this section to work.
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#
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# Please note that this is only suiteable as an example. There are
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# multiple issues with this configuration method. For example, if you go
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# this way, you'll give your spamassassin daemon write access to the
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# entire exim spool which might be a security issue in case of a
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# spamassassin exploit.
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#
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# See the exim docs and the exim wiki for more suitable examples.
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#
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# warn
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# spam = Debian-exim:true
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# add_header = X-Spam_score: $spam_score\n\
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# X-Spam_score_int: $spam_score_int\n\
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# X-Spam_bar: $spam_bar\n\
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# X-Spam_report: $spam_report
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# This hook allows you to hook in your own ACLs without having to
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# modify this file. If you do it like we suggest, you'll end up with
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# a small performance penalty since there is an additional file being
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# accessed. This doesn't happen if you leave the macro unset.
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.ifdef CHECK_DATA_LOCAL_ACL_FILE
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.include CHECK_DATA_LOCAL_ACL_FILE
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.endif
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# accept otherwise
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accept
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