I installed and tested Mailman3. I imported a Mailman2 list. All looks good but I get this error.
Recipient address rejected: User unknown in virtual alias table; from=<hit(a)options.org> to=<atm(a)alist.net>
The aliases seem to show up find in the GUI for the control panel software I use. Postfix virual file has a mapping of atm to atm(a)alist.net .
It seems mailman at least sees the connection. From the smtp.log under mailman:
`Mar 02 10:14:13 2023 (1242405) ('127.0.0.1', 56410) recip: atm(a)alist.net
Mar 02 10:14:13 2023 (1242405) ('127.0.0.1', 56410) Data: b'DATA'
Mar 02 10:14:13 2023 (1242405) ('127.0.0.1', 56410) Data: b'QUIT'
Mar 02 10:14:13 2023 (1242405) ('127.0.0.1', 56410) connection lost
Mar 02 10:14:13 2023 (1242405) Connection lost during _handle_client()
Mar 02 10:53:13 2023 (1242405) Available AUTH mechanisms: LOGIN(builtin) PLAIN(builtin)`
