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Question about multiple domains and user accounts

From: Travis Knaack (traviskspeedexpress.net)
Date: Tue Jun 06 2006 - 01:39:07 CDT


I am trying to build a new mail server for a company using courier/postfix.
The old server used .mbx format on Redhat. I have converted the emails
into MailDir types on a NetBSD box.
I think virtual users would be the way to go, but I am not sure.
The (old) server used system accounts for the hosted domain emails and
'regular' email accounts. There is no separation of the two except for
the Exim aliases files (if the files have anything in them or not).
Example:
I have 2 system accounts ---- bill and bob2
bill = billcompany1.com, billzzz.com, billyyy.com
company1.com-aliases and zzz.com-aliases contains nothing
 -- Bill can check his email at any domain on the box.
however, bob2 owns the domain company3.com and wants the email
billyyy.com for an employee. The alias (Exim) file points bob2 ->
billyyy.com.

How can I recreate this in Postfix?
I am at a road block and ANY help would be appreciated.

Travis K.