Ibiam Chihurumnaya via Mailman-users writes:

 > I do have both inet_interfaces and inet_protocols set to all.

Note that that is just for Postfix.  You also need to specify where
Dovecot and Mailman are listening in their own configurations.

I suspect that Postfix will prefer IPv6 if available, so using
"localhost" as the Mailman host may cause confusion.  Use the IP
address instead.  If you specify the Mailman host as 127.0.0.1, I'm
pretty sure that will work fine, as Mailman will listen on the
specified port via IPv4, and the Postfix routing tables will be
created with 127.0.0.1 and the specified port.

I don't know if Mailman will do the right thing if you specify [::1];
as far as I know we have never checked that Mailman is IPv6-clean,
although the underlying Python libraries probably are.

If you have a preference for IPv6, we can discuss that after getting
everything working with the well-tested IPv4 configuration.

-- 
GNU Mailman consultant (installation, migration, customization)
Sirius Open Source    https://www.siriusopensource.com/
Software systems consulting in Europe, North America, and Japan
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