On Mon 31/Jan/2022 16:43:05 +0100 Al Iverson wrote:
What will that do to legitimate messages that pass through
a mailing list that changes the subject line but does not
use DKIM ?
In this scenario, my mailing list manager strips the original DKIM
signature and applies its own, as I am now the party responsible for the
message. (I also rewrite the from address.) This has worked fine for me,
but not everyone is a fan of this methodology.
There is no reason to strip the original DKIM signature. There are DKIM
filters which can remove such simple changes as the subject line, and verify
the original signature. For example, for the message I'm replying to, the top
of the header in my INBOX includes the following:
Return-Path: <[email protected]>
Authentication-Results: wmail.tana.it;
spf=pass smtp.mailfrom=mailop.org;
dkim=pass reason="Original-From: transformed" header.d=wombatmail.com
From: Al Iverson <[email protected]>
Note that the From: line is at the top. Near the bottom I have the following:
List-Subscribe: <https://list.mailop.org/listinfo/mailop>,
<mailto:[email protected]?subject=subscribe>
Munged-From: Al Iverson via mailop <[email protected]>
Reply-To: Al Iverson <[email protected]>
The instruction which fixes MLM munging is illustrated here:
https://www.tana.it/sw/zdkimfilter/zdkimfilter.html#mlmtrans
Best
Ale
--
_______________________________________________
mailop mailing list
[email protected]
https://list.mailop.org/listinfo/mailop
