I've installed my reverting DKIM verifier. Today it failed on a specific
message which I also received directly. The reason it failed is the Subject:
field was rewritten like so:
Subject: RE: [dmarc-ietf] A policy for direct mail flows only, was ARC
Subject: Re: [dmarc-ietf] A policy for direct mail flows only,
was ARC questions
The message is tagged X-Mailman-Version: 2.1.29. Is it Mailman doing that
change? I found some code which may seem to be doing something like that in
rematch = re.match(
subject = subject[rematch.end():]
recolon = 'Re:'
It seems I have to save the subject if it matches that string, correct?