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Front end servers routing Internet mail

We have two Exchange servers hosting mailboxes. We just installed an Exchange Server 2003 server as a front end. However, we noticed our outbound and inbound Internet mail is not being routed through it. How can we change it make this possible?

We have two Exchange servers hosting mailboxes. We just installed an Exchange Server 2003 server as a front end. However, we noticed our outbound and inbound Internet mail is not being routed through it. How can we change it make this possible?
This is a very common misunderstanding about SMTP and front end servers. The truth is, SMTP does not get "front ended" as other protocols like HTTP/HTTPS (used by OWA, OMA, ActiveSync, RPC over HTTP), IMAP4, and POP3 do. In fact, SMTP running on a front end is no different than SMTP running on any other Exchange server. This means a front end server -- which by definition do not host mailboxes -- will never see any outbound SMTP traffic. You will need to make it a bridgehead for a SMTP Connector (for the address space * for outbound Internet mail) -- to route outbound SMTP traffic through it.

Inbound Internet mail is directed to the appropriate Exchange/SMTP server that the MX records in your external...

DNS zone(s) points to. You will need to create/point an MX record (with low preference number) to point to your front end server's external/NATted IP address to see inbound SMTP mail flow through that front end server.

This was last published in July 2006

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