October 11, 2008 08:19pm pdt

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	[x] Attachment Details

Smart Host routing on Exchange 2007

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6.4

Zones: Exchange Email Server, Simple Mail Transfer Protocol (SMTP)

Tags: Microsoft, Exchange, 2007, Smart Host Routing

My apoligies for the long winded explanation.

A client has a mail appliance that their users POP3 or webmail their mail from. The appliance is a MiraPoint email box (*nix based).

They wish to slowly upgrade to exchange 2007. I have built an exchange 2007 CCR mailbox cluster on server 2008 with a seperate hub transport/client on server 2008. A unified messaging box is still to come. The AD is brand new and has the domain name orgname.local. There is an existing domain so users in Exchange will be of 'linked type' mailboxes.

My question relates to mail routing.

Users will be moved one by one over a long period of time to the exchange environment.

Incoming mail from the internet will be delivered to the mail appliance. If the user has been moved to exchange the user object in the mail appliance will be configured to forward from user@orgname.com to user@orgname.local. Recipient policy on exchange is configured to accept mail from both @orgname.com and @orgname.local. Exchange server is configured with bith orgname.com and orgname.local as accepted domains. Internally there is an mx record so that the mail appliance can find the exchange server to deliver forwarded mail.

There are three scenarios here related to the new exchange server:
1) Internal exchange user to internal exchange user: The mailbox server should route the mail with no further configuration

2) Internal exchange user to other internet mail server: Mail is delivered directly from exchange hub transport server to the internet.

3) Internal exchange user to mail appliance user: How does the mailbox server know deliver mail via SMTP to the mail appliance when both mail appliance and exchange server accept mail for @orgname.com domain? How do we avoild potential mail loops?

My question relates to scenario 3. I understand that this has something to do with Smart Hosts but I've never done this on Exchange 2007 before, only on Exchange 2003.

Thankyou in advance for any assistance.

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