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How do i configure Exchange to only send emails internally (but some users will have POP3 on their Outlook Clients for sending)

I'm assisting a client with an exchange 2003 installation, and they have categorised their users in 2 types - the first should only be able to send/receive emails within the exchange organisation (a closed system essentially), but the second group of users will have POP3 on their outlook clients aswell as access to the closed email system.
What is the best way to stop exchange from processing emails bound for external systems - i currently have clicked the "Disable outbound email" in Queues - but this will build messages up won't it ?
Also, is there anything i will need to do on the users who have pop3 mail to send mail directly from the client unless it's going to an internal exchange user ?

Many thanks for any assistance
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I would not be using POP3 for your super users, you can do it correctly like so -> http://www.amset.info/exchange/restrict-internetmail.asp

zippybungle2003Author Commented:
Hi, thanks for this.
The reason POP3 will go to some users is down to how this site gets it's emails (from a public authority).
We can't change them to a proper SMTP feed just yet.

It seems that i can only enter user names on a black or whitelist - can groups be used ?
If you must have mail come in on POP3, I would still be moving that to the server with a POP3 connector.

Yes, you can use a group, if it is mail enabled - this is in the guide.

Forced accept.

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