Domain in username - ReadList.com

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Domain in username
\ Lionel Pinkhard (22 Jan 2008)
. \ (Wietse Venema) (22 Jan 2008)

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Subject:	Domain in username
Group:	Postfix-users
From:	Lionel Pinkhard
Date:	22 Jan 2008

Hi,

We are attempting to migrate 653 mailboxes from a Sendmail server to a
new Postfix server. However, we would like to do this in the simplest
way possible, any recommendations on this would be appreciated. We would
need to move the mailboxes, import the users and passwords (passwords
are encrypted), at the moment I'm thinking that writing a script to
parse the /etc/passwd file and insert the info into the MySQL database
(we are using Postfix with MySQL, Courier-IMAP, etc), this would
obviously leave the passwords in encrypted form (and leaving the
clear-text version of the password blank), but would the encrypted forms
of Sendmail and Postfix be compatible?

Currently, our workstations' mail clients are configured as follows
(assuming e-mail address of fred) for Sendmail:

Incoming mail server: pop.domain.com
Outgoing mail server: smtp.domain.com
Username: fred
Password: fredspassword

The DNS A record for pop.domain.com points to the old mail server's IP,
same goes for the MX record.
smtp.domain.com points to another relay server (this will remain unchanged).

The Postfix server would (according to our configuration), require the
clients to be setup as follows:

Incoming mail server: pop.domain.com
Outgoing mail server: smtp.domain.com
Username: fred
Password: fredspassword

In this case we can update the DNS A and MX records to point to the new
server, solving most issues. However, this would require each and every
workstation to change it's configured username to the full e-mail
address. Now, what I would like to know, is it possible to configure
Postfix to automatically add @domain.com to a username if it is not
specified? We don't want to change the login method totally, since we
want to support more than one domain on this server, we intend on
hosting an additional 4 domains on this server, running of about 2000
mailboxes on a single server, instead of using 4 servers. (All the other
servers except the specific one I'm refering to are already using the
user username syntax, so specifying something like a default
domain to accomodate this server would be nice), I don't feel like
running around changing 653 PCs' configuration, I would write a script,
but these computers are running everything from Windows (Outlook,
Outlook Express, Windows Mail, Thunderbird, etc), Mac, BSD, Linux to
Windows Mobile (There are PDAs and mobile phones also configured to
fetch from the server) and even DOS.

So any ideas would be highly appreciated. Thanks in advance.

Regards,

Lionel