Telnet to yourmailserver at port 25 and issue all the following commands:


telnet hostname/ip 25


mail from:

rcpt to:

If you are getting the error “554 : Relay access denied” then the server is not an open Relay

If not Just pass the command “DATA” sfter the recipient and then enter the message ending with a period ie : “.”

If you get the reply “SUCCESS Relay Accepted – final response code 550″

Then as you feared your server is subjected to open relay and if not enjoy………. It is not

I hope your server is not open relay supporting, but if it is so, as it is a Cpanel Server you can stop it normally using the below scripts



/etc/rc.d/init.d/antirelayd restart

service exim restart