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 =
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