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Prevent Exchange 2003 users from sending or receiving Internet mail

Serdar Yegulalp
07.07.2005
Rating: -4.38- (out of 5)

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Some time ago I wrote about how to prevent Exchange 2000 users from sending mail to the Internet. Exchange Server 2003 has functionality that now makes it easy to stop users from receiving mail sent to them from the Web as well. Once configured, users can only receive e-mail from other Exchange users in the same organization.

To make this happen, you first need to prevent Exchange users from sending e-mail to the Internet:

Now, you need to configure Exchange to prohibit users from receiving Internet-based e-mail:

The "authenticated users" checkbox is new to Exchange Server 2003, and essentially limits mail traffic to only those who can successfully authenticate with the server (i.e., other Exchange users).

About the author: Serdar Yegulalp is editor of the Windows Power Users Newsletter and a regular contributor to SearchExchange.com.

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I created a security group and mail-enabled it. I assigned the users that I wanted to have only internal mail capability to this group an

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d followed all the other steps in the tip. It didn't prevent outgoing OR incoming email to/from the Internet. Please advise.
—Pouya M.

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I did a little more digging and found that there are a couple of Microsoft Knowledge Base articles that deal with the possibility that connector delivery restrictions might not work properly or connector restrictions might be disabled. It looks like both of these articles talk about the same registry setting, but talk about it in slightly different contexts.
—Serdar Yegulalp, tip author

Do you have comments on this tip? Let us know.

Related information from SearchExchange.com:

Reference Center: Exchange permissions

Reference Center: Exchange user settings

Reference Center: Exchange Server 2003

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