Multiple domains, duplicate emails, one mail server?

Aaaaaargh,

[Ankheg]

In the past when I've needed to use a single machine as a mailserver for multiple domains, I've used Cpanel. However, I'm now trying to do the same with a machine that doesn't have Cpanel installed, and getting frustrated.

Here's what I want to do (and which I'm starting to think can't be done), under Debian Woody:

Have this machine, mail.widgets.com, act as a mailserver, SMTP and POP3, for three domains - widgets.com, domain.com, and domain.org. The problem is I can't create - without some real ugliness - the same username on multiple domains, with separate passwords. I want, for instance, [e-mail] to be able to POP the server using "[e-mail]" for his userid, not "[e-mail]"; and similarly. I think it's doable, I'm just not sure how. It's not just a Sendmail/Qmail "virtual host"; I'm trying to create actual POP3 users in the form of [e-mail], and can't seem to do it.

Any ideas?

[Ankheg]

Ah. Vpopmail. Thanks for the emails, everyone. :) I knew there had to be a way...