This really sounds like a problem with your docker host environment, not the Mailman container.
What happens when you run Jörg's example command of "docker exec mailman-core curl https://publicsuffix.org/"?
Are you able to resolve, ping, traceroute (etc) from within the mailman-core container you are running?
--Jered
----- On Jan 9, 2024, at 12:02 PM, bob B via Mailman-users mailman-users@mailman3.org wrote:
what version are you running?
I also see the same thing on image: maxking/mailman-core:0.4.5
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