Mail spam problem

Hi,


I am a domain reseller, now when ever i create a new domain, the mails from those domain get sent to the spam and i am hosting quite a few domains on my shared sever, now how can i find out which of my domains are sending spams which is destroying the reputation of my server. What should i do after finding out that they are sending spam?


Any idea?



Please help.

Thanks!



I didn't find the right solution from the Internet.



References

forums.cpanel.net/threads/mail-spam-problem.591991/


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