Mail open relay

If you have an Open Relay or want to test to see if you do, go to this web site.

http://ord.org/submit

This site will test to see if you actually do have an open rely. So once you do the fix you can test to be sure the relay is closed.

ThisURL will bring you to a page that will have the mail servers listed so you can find the instructions on how to fix your mail server to stop the open relay.

http://ordb.org/fix/

I have done this for 3 companies with Microsoft Exchange Server 5.5 so far and each one is not fixed.

Test it here:

http://www.abuse.net/relay.html

More info here:

http://mail-abuse.org/

As to closing it, what are you using? What have you tried?