Stop Open Relay of Exim

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



3 thoughts on “Stop Open Relay of Exim

  1. peter says:

    I tried this but my server still works as open relay, when i run antirelayd i see:

    tailwatchd is running.

    restarted exim and still can send emails telneting port 25 from anywhere


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