FRONT-END server and SMTP
In regard to configuring a FRONT-END server. The MOAC module 8, page 12 makes reference to "Dismount the mailbox and public folder stores on the front-end server, and disable the Exchange Information Store service". Sure, I get it, its not a MAILBOX store, it's basically an entry point for OWA to a backend farm. Then, in the same paragraph it mentions: "If the front-end server is also running the SMTP Service, then the mailbox store must be mounted and the Information Store service cannot be stopped." Well, now I'm a little confused. I get the fact that you would drop most all protocols on the front end because HTTP (OWA) is doing most of the work. SMTP is a SEND protocol for lack of a better word. So if the back-end virtual servers ( or SMTP connectors ) are doing the grunt work of sending messages outbound why would you have SMTP on the front-end? - or - What scenario would you have SMTP loaded on the front-end? You guessed it, I'm studying for the 70-284...Regards from the MidwestLMC
February 16th, 2009 11:23pm

In a FE/BE topology, if there are POP3/IMAP4 client, SMTP service shall be enabled for them, FE will act as a proxy, forward clients logon request to the right BE server. Otherwise, you will need to have a separate SMTP server for such clients If you want the FE to act as a bridgehead (Gateway) for mail flow, SMTP service must be running on it as well Resources: Front-End and Back-End Server Topology Guide for Exchange Server 2003 and Exchange 2000 Server Exchange Server 2003 Transport and Routing Guide
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February 17th, 2009 5:39am

JamesThanks for your response. It took a minute for the light bulb to turn on. POP3/IMAP are receive ONLY protocols. Naturally for the messages to go outbound SMTP would have to be enabled. I didn't pick up on it at first but it makes perfect sense. Thanks again for your prompt response.RegardsLanceLMC
February 17th, 2009 1:50pm

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