In our quest to stop 'some' of the spamming techniques, I was wondering if there is a way to disable user 'nobody' from sending emails on either a domain or account level - rather than server-wide?
Reason for asking is that I would like to allow 'nobody' emails to just a handfull of trusted clients that have never had problems.
If you are running cpanel (i beleive you are) , you can disable the nobody emails and enable suphp. Once done , you an detect who is sending too many mails using the exim stats and take appropriate actions against the spammer
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You can't do that in cPanel, it had to be server-wide. You're better off disabling nobody from sending out email as it's a security risk, and there isn't any need to have it enabled with proper coded scripts.