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Require a specific from: domain name before allowing smtp connection

Posted on 2008-10-22
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Last Modified: 2013-11-30
Users connecting to our Exchange 2003 server can relay if the have a valid username/password.  Which I believe is the default setting on an Exchange server.  

Is there a way to restrict smtp connection for relaying for users that doesn't specify the correct from domain name?  

For example.  If our domain was ourdomain.com , the from: part of the user email address needs to contain the @ourdomain.com before allowing to relay ?

Thanks!
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Question by:digi_net
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by:bmatumbura
ID: 22783571
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by:bmatumbura
ID: 22783580
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by:bmatumbura
ID: 22783593
This is for Exchange 2000, but should work on 2003 as well:

http://support.microsoft.com/kb/313395/
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by:digi_net
ID: 22790554
I read thought the links but it doesn't really say how it can have it so that only when it contains a specific "from domain address" will it relay be allowed for that user.  I see the documents describes how it will accept e-mails only from having a specific domain.

Basically what I'm hoping to do is.  Have smtp validate that the from: contains the @ourdomain.com before it allows the user to relay to anywhere on the net.
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by:bmatumbura
ID: 22793862
Now I get it. It's easy... have a look at the attached screen shot:
disable-relay.JPG
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digi_net earned 0 total points
ID: 22801720
I've looked at this, but this doesn't let me relay based on the criteria to check that the email address has a valid from: ourdomain.com before allowing to relay.
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