Sometimes your server might face mail problems as the server is configured for open relay.
Open Relay:
This allows SMTP server to be configured in such a way that it allows anyone on the Internet to send e-mail through it. This can blacklist the server’s IP address
To disable Open Relay on the cPanel server you can follow following simple steps:
Login to WHM.
Navigate to WHM >> Main >> Tweak Settings >> Initial default/catch-all forwarder destination.
Set this setting to Bounce / Fail.This should turn off the open relay on the server.
“Bounce” / “Fail” is usually the best choice if you are getting mail attacks.
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