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I have a situation where I need to configure an MTA to relay messages for a single domain ( to multiple (3) seperate SMTP servers. Email for received on SMTP-1 needs to be relayed/routed to SMTP-2, SMTP-3, & SMTP-4. Any advice would be greatly appreciated. The MTA can be anything from Exchange to Postfix. Whatever does the job.

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If I'm understanding you correctly you should be able to create another SMTP connector in Exchange for the address space, give it a lower cost then the default SMTP connector, and configure it to forward all email to SMTP-2, SMTP-3, and SMTP-4 as smarthosts.

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I did as you suggested, however it appears that the Exchange server (2010) is only delivering to the first smart host in the list and ignoring the others. I need to have the mail relayed/routed to all 3 additional smtp servers. Sorry if I wasn't clear. – user55812 Oct 1 '10 at 0:39
Oh. My apologies, I thought this was Exchange Server 2003. I'm afraid I don't know anything about Exchange Server 2010. – joeqwerty Oct 1 '10 at 1:50
I'm able to implement an Exchange 2003 server. Are you saying that it would send to all of the configured smart hosts if setup this way in Exchange 2003? – user55812 Oct 1 '10 at 4:36
I've never done it so I can't verifiy it but that's my understanding. Also, I've read bits and pieces about doing it in Exchange Server 2007 so I'm sure it's also possible with Exchange Server 2010. Maybe a little Google fu will help. – joeqwerty Oct 1 '10 at 10:50

Can you explain what you're trying to accomplish? That's not a typical request. If the 3 smtp servers play different roles (archiving, spam, av, etc) they're typically setup as a pipeline, not a tree.

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