mailman-request is where requests for the "mailman" mailing list go…not user-created lists. This is purely intended for the administrator(s) to get mailman related information, as far as I know. So, users should have no reason to mail to mailman-request. It should still work, though.
So, the mailman list is a special list that has to exist before mailman will even start…if you didn’t use our install.sh script to install Virtualmin, this list may have never been created or created improperly (and, even if you did use install.sh…maybe something went wrong).
Anyway, see if you have a mailman list using the list_lists command.
If not, create it using the newlist command, and add the suggested aliases to the /etc/aliases file, and then run newaliases.
You haven’t identified your OS/version, so I can’t tell you where these commands are–they’re in different places on different systems.
The key bit actually missing is the aliases for the mailman- addresses. Something along these lines (but these paths are almost certainly wrong–you MUST correct them to match where the mailman binary resides on your system):
But, again…there’s no reason for users to send email to the mailman-request address. They will send to “listname-request” for whatever value of “listname” they are subscribed to.
