3.32. What's the regex syntax for header filter rules (in privacy options/spam filters)?
Use this regexp to match messages with the word "Phentermine" (a well-known spam word) in their subject:
Note that the entries in header filter rules are Python regular expressions. They are searched (not matched) in multiline mode ignoring case against a long string consisting of all the message headers and mime part headers strung together and separated by newline (\n) characters.
Note that prior to Mailman 2.1.6, the header string contained only the message headers and not the part headers, and prior to Mailman 2.1.7, the search was not done in multiline mode so only the second form with '\n' and not '^' would work.
See the section on 'Regular expression operations' under 'String Services' (currently section 4.2 but subject to change) at http://docs.python.org/lib/lib.html.
Also note that as of Mailman 2.1.11, the headers are not RFC 2047 decoded so RFC 2047 encoded headers may not match as expected. This is planned to be fixed for Mailman 2.2.
Last changed on Sat Mar 1 04:44:16 2008 by Mark Sapiro
Converted from the Mailman FAQ Wizard
This is one of many Frequently Asked Questions.