[opendmarc-users] Why are mailing-lists stashing my mails?

[onyeibo]

Hello everyone,

I am new here. I started having a hard time with dmarc recently. Mails from my mail-server deliver without issues when sent to regular addresses (say, user at domain.com). However, when I send to a mailing-list they are discarded along the way (say list at domain.com). I administer a mailing-list, so I had the privilege to observed the following:

The recieving server verifies and passes my dkim/dmarc. Therefore, mailman (list-server) recieves the mails and archives them. It then fails to send off the mails to subscribers with the following error:
Jul 01 11:51:35 list.server.com opendkim[663]: 40D84274532: no signing table match for 'user at mydomain.com'

Jul 01 11:51:35 list.server.net opendmarc[826730]: 40D84274532: mydomain.com fail

What is happening here and how do I remedy the situation? My understanding is that the server wants to sign my mail all over again. I could not subscribe to this list with the affected address. I assume the issue affected the subscription too. I must have missed something in my configuration.
What should I do?

Regards
Onyeibo

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