DMARC & our mailing lists

Ihsan Dogan ihsan at
Tue Nov 15 14:37:28 CET 2016


As you have probably heard, bigger mail providers are started to
reject mails based on DMARC. DMARC is a technique to reduce spam
and phishing e-mails and relies on SPF on DKIM.

The problem with mailing lists are, that they are changing the
mail headers and this causes DKIM to fail - and therefore DMARC.

The solution for this is rewriting the From: field in the mail
header. I've upgraded our Mailman installation today to the most
recent version, which has propper support for DMARC.


If you are forwarding your e-mails to your private
e-mail address, please keep in mind that this also brakes DMARC.
If you want to have your mails forwarded, I stronlg recommend to
collect your mail via IMAP.


ihsan at

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