[Mailman-Users] DNSException: Unable to query DMARC policy

Dear all,

lately my mailman instance has applied the DMARC workarounds an increasing number of mails. Looking into /var/log/mailman/error, I see a large number of messages containing the string "DNSException: Unable to query DMARC policy for [address]: connection timed out".

We are running Ubuntu 18.04 LTS, the current mailman version is from 2018. Except from installing the occasional security updates, I don't see what has changed, that might be responsible for these timeouts. What command does mailman use to query for the DMARC status of an address?

Cheers, thanks a lot for any hint...

Johannes