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Can I route to different smart host based on mailfrom domain?

My layout....

2 seperate domains (more, but for simplicity's sake...)
1 E2k server.
1 SMTP relay for each domain.

So on the Exchange box are all the mailboxes. joe@a.com and jon@b.com. B.COM mail comes into mail.b.com and A.COm mail comes into mail.a.com. Then the relays forward the mail (after spam filters and other fancy archiving stuff) to the Exchange box and voila, we have delivery. When both a.com and b.com users send mail, it is routed to a smart host - only one - so b.com's email actually goes OUT on a.com's SMTP relay. That's bad and i don't want that and legally I can't have that. I can add virtual host all day long and IPs to the Exchange box as necessary. So how can I route outgoing mail from joe@a.com's email to mail.a.com and jon@b.com to mail.b.com?

Thankx
8-M4n
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8-M4n
Asked:
8-M4n
2 Solutions
 
JasonBighamCommented:
I did what you are trying to do via two routing groups and two SMTP connectors which are restricted to the associated routing group... but I have two servers.

http://www.experts-exchange.com/Networking/Email_Groupware/Exchange_Server/Q_20768191.html

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AdamGatesCommented:
To control the outbound domains create two SMTP Connectors and set the address space on each to their respective domains. Then set the Smart host for each to the SMTP gateway of your choosing.
I see no need for two E2k servers.



something else that may interest you if you ever put E2k on the Internet:
To get a virtual server to respond with a different domain name on the same server http://support.microsoft.com/default.aspx?scid=kb;en-us;287647&Product=exch2k
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