eMail relaying withe cPanel/WHM Cent OS

Your server should not be an open relay by default. If it is, then something is wrong because that is not normal. You should check the logs and also may have to reinstall exim.

 

I am having the same problem, one user was sending out spam through the email server and the header from lines werent even from any domain names on the server how can we fix this.

 

Once a user authenticates to the server (either via POP or SMTP) they can send email. The email's reply-to and from headers don't necessarily need to point back to your domain. This is useful if the user has configured their mail client with multiple reply-to addresses and wants this particular email recipient to reply to another account (e.g. a personal gmail account).

 

Ok understandable ok see if you can help me out with this one. Even when i have SMTP tweak enabled on my server, a user has a perl script that connects to a database and sends massive amount through smtp which bypasses my 500 domain limit. what should i do

 

Are you running SuExec on the server? If the script is running as user nobody (not SuExec) then the max emails per domain per hour will not be enforced.