Sending and Receinving pop3 mail on Exchange 2003 from a different domain

I'd like to know if it's possible, and if so how to make a single exchange 2003 server that's on domain mydomain.com pull e-mail from a pop3 server on xyz.com to its mailboxes.  Also, can the exchange server be setup so that the mailboxes receiving the pop3 mail be made to send mail as the a pop3 account from domain xyz.com?  In other words mydomain.com is on the exchange server. I want it to pull e-mail from certain pop3 accounts at xyz.com.  I then want it to be able to send mail back through the pop3 server as an xyz.com address and still have it's normal functionality of mydomain.com SMTP.  Is this possible?  If so, how can it be done?

mtmtechAsked:
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v2MediaCommented:
Receiving is possible in two ways. Add email addresses to user accounts for xyz.com and have exchange collect email from a catchall account such as mail@xyz.com. Open the POP3 Conn Manager and configure a new schedule for mail.xyz.com and define it as a global for distribution.

Second option, open POP3 Conn Manager and configure individual email address collection schedules for each xyz address then define each schedule as user level and deliverable to the applicable user mailbox.

Unfortunately all exchange accounts are lumped together in the Outlook client. However you can configure an additional mail account on each user's Outlook client for' user'@xyz.com that never polls to receive, just send. The "More Settings" button has to be clicked to get to advanced authentication options:

Internet Email Settings > Outgoing Server > check "My outgoing server requires auth..." and select "Use same settings from incoming server for individual mail boxes or the user/pass for the catchall account.

Just be sure to exclude this account from the receiving group. The user can then choose which account to send from when they're composing the message via the "Accounts" button. All in all an ugly solution, but its probably the best you're going to get.
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