Setting up IP restrictions for ExchangeDefender

The following guide helps you setup IP restrictions to allow only ExchangeDefender mail servers to connect to your network. We encourage all customers to configure IP restrictions because spammers and hackers should not be allowed to connect to your server directly without going through us. As a matter of fact, nearly all direct server SMTP connections after the MX records have been switched over to ExchangeDefender should be considered as hostile. Hackers and worms often scan entire networks to find vulnerable mail servers to be exploited. By only allowing access to the ExchangeDefender network you can reduce your exposure of critical services on the Internet.

This guide applies to Microsoft Exchange 2003 which is also a part of Microsoft Small Business Server 2003. To get started login as the Administrator and click on Start > All Programs > Microsoft Exchange > System Manager.

You will see the Exchange System Manager screen shown below. Please expand the Servers folder, expand Your server folder, expand Protocols folder, SMTP folder and finally right-click on the Default SMTP Virtual Server and select properties.

Click on the Access tab and then on the Connection button. This is where you will setup your IP restrictions. Note: You can also setup IP restrictions on your firewall.

Select Only the list below to restrict access to your SMTP server to ExchangeDefender networks only. Click on Add to start adding IP address ranges. 

Select Group of Computers radio button and type in the subnet address and the subnet mask. There are several:

65.99.192.0 / 255.255.255.0
65.99.255.0 / 255.255.255.0
64.182.164.0 / 255.255.255.0
64.182.133.0 / 255.255.255.0
70.84.106.0  /255.255.255.0
72.29.99.0 / 255.255.255.0
216.123.109.0 / 255.255.255.0
64.182.140.0 / 255.255.255.0
64.182.139.0 / 255.255.255.0

After you have entered all the IP address ranges click on Ok. Click on Apply.

That is all! If you have any questions or if you would like us to assist you in the process described above please open up a support request at https://support.ownwebnow.com or just give us a call at (877) 546–0316