[Mailman-Users] DKIM/DK-milter with Mailman

[SM]

Hi,

I tested Mailman 2.1.8 with dkim-milter 0.4.1 and dk-milter 
0.3.4.  The server running Mailman signs all outgoing mail and 
inserts DKIM-Signature and DomainKey-Signature headers.

Incoming mail verifies successfully.  Mail sent by Mailman fails 
DomainKeys/DKIM verification at the subscriber's end because of the 
Authentication-Results: header inserted when the subscriber's posting 
is DKIM/DomainKeys signed.

The workaround is to configure Mailman as follows:

Change the Mailman/Handlers/CleanseDKIM.py lines from:

  def process(mlist, msg, msgdata):
      del msg['domainkey-signature']
      del msg['dkim-signature']

to

  def process(mlist, msg, msgdata):
      del msg['domainkey-signature']
      del msg['dkim-signature']
      del msg['authentication-results']

Thanks to Jim Popovitch for working on the fix.

Regards,
-sm