After I made those aforementioned changes (sorry email got sent prematurely) I have finally managed to send to and receive mail from my local list successfully. Thank you for your help! I'm sure I'll be back with more questions in the future.

On Sun, Jul 26, 2015 at 1:00 PM Thomas Storey <storey.thomas@gmail.com> wrote:

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 mailman@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 < thomas@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}