Prohibing relaying third party email

[Guest_imported]

Hi,

my question is the following one :

How to secure an exchange mail server against third-party relay, in order to, first of all, be deleted of the RSS lists (

http://www.mail-abuse.org/rss/).

It's very urgent.

Thanks a lot for the response.

 

[jayanth]

In Exch 5.5, open IMS, goto the Routing Tab, and under routing restrictions select the appropriate things that u need to stop third party relaying

 

[cgwright]

Essentially that's it. To give a little more detail, go to the IMS connector properties/routing/routing restrictions. Then set the "Hosts and Clients with these IP addresses" to cover your users. If you have a simple LAN system, then setting the 192.168.0.0 with a 255.255.0.0 mask will do it. This means that only people who connect from within the LAN can send emails to the Exchange server. Modify if you are not using 192.168.. addressing on your LAN. Obviously it becomes more complex if you have other users connecting, but you can still limit who can use you server to send emails.

Spammers scour the Internet looking for unrestricted Exchange servers to use for their wretched messages, as you have no doubt discovered. Set some simple restrictions to stop them, and you will be able to get off the RSS blacklist.