[Mailman-Users] How to strip S/MIME attachments

Adam Engst ace at tidbits.com
Thu Nov 3 21:05:42 CET 2011

Hi all,

I'm trying to set my list so that it strips the S/MIME digital
signature attachments that some mail software adds to every message
(iOS 5 is a culprit here). However, no matter what I do, Mailman seems
to see the message as not having content, such that it's forwarded to
me, the list owner, rather than being sent on to the list. My content
filtering settings are as follows:

filter_content: Yes
filter_mime_types: application/pkcs7-signature
pass_mime_types: multipart/mixed, multipart/alternative, text/plain
filter_filename_extensions: exe, bat, cmd, com, pif, scr, vbs, cpl, p7s
pass_filename_extensions: blank
collapse_alternatives: Yes
convert_html_to_plaintext: Yes
filter_action: Forward to list owner

In particular, note the filter_mime_types and the last entry in
filter_filename_extensions, which are what I've added to try to get
rid of these attachments.

Any ideas what I might be doing wrong, or if I'm missing something
that prevents Mailman from handling S/MIME attachments properly?

cheers... -Adam

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