And your other questions:
Are there a set of mailman aliases in /etc/aliases No, that file looks like I have never touched it. It contains
# See man 5 aliases for format postmaster: root
I do have mailman aliases in
/usr/lib/mailman/data/aliases
# STANZA START: mailman # CREATED: Sat Jan 30 22:48:49 2021 mailman: "|/usr/lib/mailman/mail/mailman post mailman" mailman-admin: "|/usr/lib/mailman/mail/mailman admin mailman" mailman-bounces: "|/usr/lib/mailman/mail/mailman bounces mailman" mailman-confirm: "|/usr/lib/mailman/mail/mailman confirm mailman" mailman-join: "|/usr/lib/mailman/mail/mailman join mailman" mailman-leave: "|/usr/lib/mailman/mail/mailman leave mailman" mailman-owner: "|/usr/lib/mailman/mail/mailman owner mailman" mailman-request: "|/usr/lib/mailman/mail/mailman request mailman" mailman-subscribe: "|/usr/lib/mailman/mail/mailman subscribe mailman" mailman-unsubscribe: "|/usr/lib/mailman/mail/mailman unsubscribe mailman" # STANZA END: mailman
What is the content of postfix transport maps. I ran postconf transport_maps
and got the response transport_maps =