I can't set the option to limit outgoing mail in WHM.
Tweak Settings -> Restrict outgoing SMTP to root, exim, and mailman
Default is "on", but it's set to "off" (which I didn't set - it came like that with the CentOS 6 upgrade).
Set it to "on".
Message: There was an error updating “Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak)”:
No error given.
How can I fix this?
Nope, because there's never a chat option, email support no longer exists, first line don't seem to be able to raise server tickets and I don't want to spend piles of cash on the support phone line.
This should be a standard option in any CentOS build, given that it's a default "on". I can't seem to find any detail of exactly what it tweaks anywhere online, either, or I'd do it by hand.