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Checking/disabling reply of PCs on the network to Exchange

Posted on 2013-11-06
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Last Modified: 2013-11-19
I think our Exchange is configured to to allow access to the entire network (all PCs on subnet) as in the default internal receive connectors (pic below).  IS this correct?

If I only want one or two server to send mail from a tool on that server should I remove this and add individual addresses? mail
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Question by:wannabecraig
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Expert Comment

by:Simon Butler (Sembee)
ID: 39627102
The default configuration is for the connector to accept email from all IP addresses, both internal and external.

Changing the accept configuration has to be done with some care. Do you have another one that accepts email from the internet for example?

Simon.
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by:wannabecraig
ID: 39627141
Well I do have an internet connector accepting all but I want to change it so only several machines on the network can connect to the server to send mail.  Currently it looks like all machine can.  I'd like to remove /24 and add the 3 servers that actually need to send.
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Simon Butler (Sembee) earned 500 total points
ID: 39629535
You have to be careful.
To receive email from the internet you need a connector that can receive email from everywhere on the internet.
The only way to do that is to change the range to

0.0.0.0-192.168.99.254
192.168.101.0-255.255.255.255

(the example being your internal subnet is 192.168.100.x).
Then you can add in the individual servers.

If you are using an external provider for filtering, then you have them listed instead, along with your internal machines that need to send.

Be really careful with the configuration though - it is very easy to block traffic you want. Remember the changes don't take full effect until you restart the transport service.

Simon.
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