An open relay is a smtp server configured in such a way that is allows a third party to relay (send / receive email messages that are neither from nor for local users). Therefore, such servers are usually targets for spam senders.
You can test if a server is an open relay via this link : http://www.mailradar.com/openrelay/
If the server supports open relay, you can stop it via the following script in Cpanel servers
/scripts/fixrelayd
service exim restart
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