Johannes Rohr writes:

 > 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.

I don't see why that would be a Mailman issue, though.

 > What command does mailman use to query for the DMARC status of an
 > address?

There's a package called dns (I think the PyPI name is pythondns).  A
module called dns.resolver is imported in mailman/rules/dmarc.py which
provides the DNS client.

Steve
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