[Mimedefang] MIMEDefang and GnuPG (cryptographic signatures)

Jonas Eckerman jonas_lists at frukt.org
Wed Oct 15 07:11:00 EDT 2008

Andrzej Adam Filip wrote:
> Could you recommend links with (tested) recipes how to implement
> verification of GnuPG signatures in MIMEDefang milter?

Our filter at
uses Crypt::OpenPGP to verify signatures. It should work for 
GnuPG signed messages AFAIK.

I haven't checked to that part of the code for a while, and we 
currently doesn't use the PGP verification results for anything 
in the gateway (except putting info in headers).

I did test it when I implemented it though, and I did use it for 
whitelisting at that time, but I don't remember if I tested it 
specifically with any GnuPG signed messages.

I do see succesful PGP verification info in out 
"Authentication-Results" headers, but I have no idea what 
software was used to sign those messages.

Jonas Eckerman, FSDB & Fruktträdet

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