how to stop nobody spam mails
 

Dear Sir,

Any body help me that how to prevent nobody spam mail in WHM server.
i'm very very big problem, i'm not stop this nobody spam mails on our server WHM 11.42.0 (build 23) centos 6.3 x86_64

i have set implented more security like as
"Max hourly emails per domain = 300"
"Prevent “nobody” from sending mail=on"

GO TO {service and configuration >configure php and suEXEC}and my php and suEXEC setting like as


Option Configured Value
Default PHP Version (.php files) 5
PHP 5 Handler dso
Apache suEXEC on
Apache Ruid2 off


Alter Configuration

Option Value
Default PHP Version (.php files) 5
PHP 5 Handler dso


BUT nobody SPAMS IS NOT STOP OUR SERVER, FURTHERMORE "Max hourly emails per domain = 300"
THIS SETTING IS NOT WORKING, AND WITHIN 10 MINUTE 15TO20 THOUSAND MAIL IS SHOT BY SPAMMING
THAT CAUSED OUR MAIL RELAY QUOTA IS FULL, AND THEN-AFTER WE FACE MORE THAN CHALLENGE FROM CLIENT CALLS
BECAUSE THEIR MAILS ARE BOUNCING AND DOES NOT Receiving AND SEND MAIL IN THEIR ACCOUNT BECAUSE OF
MAIL RELAY QUOTA IS FULL

PLEASE ANYBODY HELP ME , HOW TO RESOLVE THIS ISSUE, AND HOW TO STOP SPAMS MAILS

You appear to have skipped a few basic steps here, why is your server even being reached in the first place to send these emails? Is it bot spam from the internet? Doesn't sound like it really as they'd probably be using fake account names not "nobody". Is it cron outputs and the likes?? I really expect you should be able to remove the cause of the problem, not stop it getting worse.