An Open relay is SMTP server which is configured in such a way, which allows a third party to send/receive emails that are neither from nor for local users. For that reason, such servers are usually targets for spam senders.
You can test whether your server is an Open relay by checking in the following link:
mailradar.com/openrelay/
If the server supports Open relay, then you can stop it in cPanel server by following the steps given below:
/scripts/fixrelayd
/etc/init.d/exim restart
That’s it!!
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Absolutely right SMTP targated spam.