I'm running an Exim4 server in Debian, it's been running for about 5 years and is stable and trouble free. It handles mail for "real" users, i.e. all the users are of the form "user@domain.com" where "user" is a full system user, and the system running Exim is "system.domain.com"

Now I have to add a domain, so that as well as "user@domain.com", I can host "otheruser@otherdomain.com". I've seen numerous howtos but they are all fairly old, and there seems to be no concensus as to whether it should be done in Exim, or in association with MySQL.

Does anyone have a solid, up-to-date howto, based upon Debian Lenny (or Squeezy, but thats probably too recent to ask for)? If I've got to do a rebuild, I will update the server to the latest of everything.

Thansk for any suggestions!

Well, I got no takers for this question, so I have arrived at a way forward which isn't pretty, or scalable, but seems to work....I loaded VirtualBox on the host, set it up to have a bridged network interface, and ran a second mail server in it. That way, I had a separate domain/address, and could run the second mailserver as if it was in isolated hardware. Not pretty, because I couldn't do it if I had 200 separate domains to host, but it works for the time being