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Routing email thru pop3 on exchange clients

Posted on 2006-11-17
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Last Modified: 2010-03-06
Let me explain my exchange setup then I will get to my question. I have Exchange 2003 setup to handle internal messaging, shared calendars and contact lists, etc. However, internet email is handled by pop3 on the Outlook clients. So what I have is a pop3 acct on each client to handle internet email and an exchange acct. to handle the internal calendars and such. All clients use the exchange mailbox so that everything is stored on the server and gets backed up each night. The reason for this was to avoid relaying and the issues that go with it. All AD user accts are set to use the internet email addresses rather than the internal domain addresses so that the display and reply addresses are correct when they send internet email. When they send internet email it is routed through the pop3 connection unless it is to someone on the local network whose email address is setup in an AD user acct, in which case it is routed thru the exchange server locally. This is where my problem lies, I need all email to route thru the pop3 acct. Is there a way to stop exchange from routing any email without affecting the shared calenders, contacts and such?
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Question by:mnbaer
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Sembee earned 500 total points
ID: 17965002
This question comes up so frequently.
I will cut straight to the point.

The only way you will stop Exchange from getting involved in email delivery is to remove Exchange from the Outlook configuration.
Exchange is an email server. Outlook is its calendar. By design it will attempt to resolve all email addresses to the internal address book. That behaviour cannot be changed.
If the message contains a mixture of internal and external contacts, then the entire message will go through Exchange.

For a reliable email delivery you have two options.

1. Use Exchange as it was designed - for ALL email.
2. Remove Exchange.

No other option will give you an email delivery that you can be sure the emails will get delivered correctly.

Whatever your reasons for wanting to retain the POP3 accounts, I can come up with counter arguments.
The best advise I can give you is to use Exchange as it was designed and let it handle all of your email.

Simon.
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by:mnbaer
ID: 17965372
That being the case I will have to work out Exchange to handle all email and lose the pop3 accts. I will post a new question regarding the issues I've had using Exchange smtp. Thanks for the reply and please check out my new posting "Configuring Exchange smtp with email hosting service". I will close this question later today just to see what other responses it may get. Thanks again.

Mark
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