Thanks for your continued help Mark! Sorry for the untidy list usage.
When I first subscribed to this list about a month and a half ago I set my
subscription to digest mode, but it seems the password I have stored in my
password manager is incorrect, so I can't set it off, which has not been
helpful for this discussion obviously. Thank you for bearing with me!
In my /etc/postfix/main.cf file I indeed had both virtual_alias_maps and
transport_maps set to my /.../mailman/var/data/postfix_lmtp file. I removed
the virtual_alias_map setting and tried again, and did in fact get some
encouraging behavior.
After that, sending mail to mail...@augusta.net did not bounce, and indeed
did make it to the list, but the list was unable to send mail to users
subscribed to the list. I looked in the mail.log again and saw:
NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 550 5.1.1 <
tho...@augusta.net>: Recipient address rejected: User unknown in local
recipient table; ...
After some searching around, I found that the transport maps settings
sometimes don't work and it's better to use aliases.
So I removed the local_recipients_maps and relay_domains lines, and mapped
the alias_maps and alias_database lines to my
/.../mailman/var/data/postfix_lmtp files in my main.cf file. I also removed
the mailman lines in master.cf (the ones that look like this:
mailman unix - n n - - pipe
flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
## ${nexthop} ${user}
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