OK, I have a DH account with three domains. The main domain has email users, and basic IMAP access works great.
I am now looking into enhancing spam filtering with SpamAssassin options or maybe even DSpam, but I guess I have hit a basic problem right away:
For any of this to happen, I need a full shell user. I understand how I can create one, but how can I create/upgrade/link/whatnot such that an existing mail user firstname.lastname@example.org also becomes a shell user?
Alternatively, how do I create a shell user such that it ends up with a email@example.com email address?
I'd be grateful if someone could explain how the two account types go -or don't go- together. Thanks