Domains exceeding e-mails per hour


Well-Known Member
Sep 17, 2003
UK, Luton

We're having a major problem on all of our cPanel servers running PHPSUEXEC with a limit on the number of e-mails a Domain Name can send out per hour.

The limits are set high, 2000 per hour per Domain Name, but the sites we're hosting are considerably large and sending out newsletters. Asking all our clients to limit the number per hour is tiresome.

When the limit is exceeded, the server is completely swamped trying to resend the e-mails only to be greeted with "unroutable mail domain", load shoots up very high (100's) and all other services take a beating. Why is this happening and can be it be prevented? It’s an absolute nightmare, the only to stop it is to suspend the site in question.


Well-Known Member
Mar 13, 2004
Melbourne, Australia
cPanel Access Level
Root Administrator
Sounds like the cpanel emails per hour limit is being hit by the domain in question.

You can turn the limit up on a per-domain basis (or down) by editing /var/cpanel/maxemails to contain lines of the form '' where nnnn is the number of emails per hour and is the domain in question.

I leave the system-wide default fairly low at 250 or so, and raise it on a per-domain basis on the rare occasion people need it.