I have tried many things to cut down the spam at the server level that it is very sick.
I have enabled ClamAV, SpamAssassin and using SPF on all domains hosted through my servers. I was going to use mail scanner but I read it is no longer supported for cPanel 11.25.0-R43286 - WHM 11.25.0 - X 3.9.
I have followed the Exim configuration that is listed cPanels help section and even started to blacklist IP's of the spammers.
I have read a ton of threads here in cPanel and elsewhere on ways to cut down spam.
So I request any ideas that really works at the server level and not at the users email client side.