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sub.domain.com Exchange 2000 Server connection with domain.com SMTP

Posted on 2004-10-12
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Last Modified: 2008-01-09
I have a somewhat ordinary, but apparently less common than I thought, problem involving the following:

  * Exchange 2000 Server for email.domain.com behind ISA firewall - IMAPS, POP3S, OWA and SMTP all work fine
  * LSMTP server for domain.com residing in DMZ just outside the ISA box (MX points to this box's IP)

We're in the middle of transitioning from LSMTP to Exchange (a good move, I think).  I've set up a few accounts in Exchange and have Outlook clients connecting properly, but still pull email from our POP3 server.  I'd like to forward specific user@domain.com accounts internally as user@email.domain.com, and have Exchange populate the mailboxes.  At the same time, I'd like to allow Exchange users to send mail to domain.com users that are not yet set up on Exchange.  To do this, I've created an SMTP Connector to the domain.com SMTP server for processing.  It works (ie. I can send mail from OWA to a user not on Exchange but within our domain).  However, when I send mail to user@email.domain.com, it is somehow forwarded to the LSMTP server.  Is this impossible?

- Jer
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Question by:bigmanjer
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ATIG earned 100 total points
ID: 12289117
The first question that I have to ask is your RUS stampting @email.domain.com on the Exchange mailboxes? If so all local user on the Exchange server when sending a message will never leave the Exchange organization for those server will see that as a local mailbox.  
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by:bigmanjer
ID: 12291061
My recipient policy has the following:

        SMTP: @domain.com (DEFAULT)
        SMTP: @sub.domain.com
        X400: [standard OU stuff]

Switching the default SMTP policy to @sub.domain.com and un-checking @domain.com still allows email out, but when someone sends to @sub.domain.com, it gets rejected by the server.  Is there a need for an MX record for sub.domain.com in my DNS provider?

- Jer
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by:bigmanjer
ID: 12291338
Update: sending email to testalias@sub.domain.com (Contact in AD set up as an alias for mail forwarding) forwards to the appropraite email account properly!  Something with Recipient Policies and the external SMTP connector must be causing the confusion, I think...

- Jer
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Author Comment

by:bigmanjer
ID: 12297872
Well folks, I did some switcheroos to solve one problem: I made @sub.domain.com the default SMTP policy (keeping @domain.com in there) and I can now receive forwards from @domain.com to @sub.domain.com in Exchange.

HOWEVER, now I cannot send using my Exchange account to @domain.com accounts, which (if they do not reside in Exchange) have to be forwarded to the @domain.com SMTP server.  In fact, I could forward all @domain.com mail to the @domain.com SMTP server, it would be redirected through forwards back to the @sub.domain.com server, so really I just need ALL @domain.com email to go there.  I assume this is done with a connector, which I do have set up, but I suppose it's not complete, or isn't set up properly.

ALSO, I need to mention that the ultimate plan is to make the sub.domain.com mail server the main domain.com mail server, which I think can be accomplished fairly easily by switching the default SMTP policy to @domain.com once we make the switch.  Ideas?

- Jer
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Author Comment

by:bigmanjer
ID: 12298570
Okay, here's the thing - I made it work.  Here's how:

http://support.microsoft.com/default.aspx?scid=kb;EN-US;321721

It explains how to share address spaces (@domain.com) with other SMTP servers.  I will still award points to the answer I got, since it is closely related to Recipient Policies (the primary change I had to make to get it to work), but not the full 500 points.  Thanks!

- Jer
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