SMTP Open Relay / CPanel

Hey All, happy new year:

I'm running WHM 10.8.0 cPanel 10.8.1-R4 on Fedora i686 - WHM X v3.1.0.

Upon testing for being an open relay, i have discovered a hole in my system. Most tests reject mail correctly ("Typical 550-currently not permitted to relay through this server" response)... except one thing does allow mail to be sent:

>>> RSET
<<< 250 Reset OK
>>> MAIL FROM: <test@MY-SERVERS-DOMAIN.com>
<<< 250 OK
>>> RCPT TO: <relaytest%antispam-ufrj.pads.ufrj.br@MY-SERVERS-DOMAIN.com>
<<< 250 Accepted

(MY-SERVERS-DOMAIN is the domain name of my server...obviously SMTP Open Relay / CPanel ).

Basically, as you can see, if someone use's my domain name in their Mail From, they can send email. I can't tell if this has been a huge issue yet...

I've looked all around trying to find an answer, and this seems to be a hard thing to search for... sorry if this has been asked over and over again....

Yes, i have all the normal Exim settings. I do have RBL blocking in the conf.

Any help would be greatly appreciated!

Thanks,
Donald

 

 

 

 

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