How to restrict email in Exchange mailboxes to external and only select few internal mailboxes

Running Exchange 2003 on Windows Server 2003: I have been given the task of adding several new accounts to our domain with Exchange mailboxes. The catch is that I have been asked to restrict the email to these accounts so that only about 4 internal users can send email to them but also allow external (anonymous) email to them. The simple solution would be to put all internal users that ARE NOT allowed to send to them in a distribution group and then set the new account restrictions to allow email from everyone EXCEPT that group. The problem I see happening is that it will become a nightmare to maintain because we have several employees in IT adding/managing accounts.
Eric_CagleAsked:
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SembeeConnect With a Mentor Commented:
Unfortunately Exchange 2003 isn't setup to do this kind of restriction. Its default state is that everyone can send email to everyone else unless set otherwise. The restrictions are placed on who you can receive messages from, not who you can send to.

Therefore you are stuck with placing a restriction on everyone's account who they cannot email.

Restricting to the internet is easy enough: http://www.amset.info/exchange/restrict-internetmail.asp

Simon.
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