#pragma page-filename DOC/versions/4030565
== 3.51. Can you show me some examples of 'header_filter_rules'? ==

Example 1. I want to auto reject Bcc posts but require_explicit_destination option only holds messages.

 * Put this in your rule 1 (or perhaps following other "Accept" rules that take precedence), and make your action "Accept":

{{{
    \nto:.*your-list-name
    \ncc:.*your-list-name
}}}

 * Note that prior to Mailman 2.1.7, \n is required because these patterns are matched against a single, multiline header string and you only want to match To: or Cc: at the beginning of a line so you don't match, e.g., "Subject: Your mail To: ...". Beginning in Mailman 2.1.7, the pattern search is done in multiline mode so you can also use

{{{
    ^to:.*your-list-name
    ^cc:.*your-list-name
}}}

to accomplish the same thing. Note also that the match is case insensitive. Finally, note that 'your-list-name' can be as simple as list@example.com, but this will also match things like xyz-list@examplexcom.ca.us, so you may want a more elaborate pattern for your-list-name such as, e.g.,

{{{
    \nto:.*[,"):;<\s]list@example\.com[>\s:;(,"]
}}}

but note that this may not be exhaustively correct. Consult <[[http://www.faqs.org/rfcs/rfc2822.html|http://www.faqs.org/rfcs/rfc2822.html]]> and <[[http://docs.python.org/lib/re-syntax.html|http://docs.python.org/lib/re-syntax.html]]> and adjust this for your own needs.

 * Put this in your rule 2, and make your action "Reject" or "Discard" as appropriate:

{{{
    .
}}}

 * Yes, that is a single dot. That will allow the rule to match anything.

Example 2. Can I reject/discard those dangerous virus email?

 * This pattern can match most of the virus email (for 2.1.6 not in 2.1.5).

{{{
    content-.*name.*\.(exe|com|cmd|bat|pif|vbs|scr|zip)
}}}

 * But, be careful that this is not perfect and some users may want to use zip file for file exchange.

Converted from the Mailman FAQ Wizard

This is one of many [[../Frequently Asked Questions|Frequently Asked Questions]].