selective SMTP to curb spam

Can I selectively enable each users SMTP on a CPanel server?

I am so sick of getting whacked for spam abuse via resellers customers that I want to introduce a policy that means ID required etc for any client wanting to use our mail relay.. otherwise they can use their ISP's or other. Incoming is fine. Nobody here right now to answer my question and I'm impatient.

Thanks in anticipation.

 

 

 

 

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