How to handle mail for multiple (10-15) domains w/o localpart conflicts?

["Ralf G. R. Bergs" <rabe+debian-isp@RWTH-Aachen.DE>]

Hi there,

is there a package, HOWTO, or FAQ that aids in or describes how to setup your 
Debian box (with Exim as the MTA) to handle mail for multiple (some 10-15) 
domains without conflicts in the local part of incoming mail? Maybe even let 
them add/delete/configure mailboxes using a web interface?

Considering that people also need to fetch their mail using POP/IMAP I guess I 
need a full-blown virtual user solution (since I don't need (want?) my users to 
have system accounts on the box.)

Suggestions, hints, pointers anyone?

Thanks,

Ralf


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