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what do you guys use for spam settings? Do you just use spam assassin or the other things installed with Plesk? I have SA set to delete all spam above 7 after much testing and each user still gets 20-30 a day.
I have some experience, using CentOS.. yes I can ssh in as root and move freely, but I don;t how to do much, but am willing to learn.... I hate spam, it is killing my company email.
Look at http://www.asspsmtp.org this is realy kicking. I am using it for about a year now and now receiving maybe one spam message (assp didn't catch) a week. Very very effective.
I wrote a wiki entry on how to implement it in a plesk environment. Assp runs on win32 and linux (Perl).
Assp is a proxy smtp server, so you don't have to change anything on plesk (just some settings).
CentOS - good - have a look around that site I linked you too. Also that ASSP looks like a decent solution as well. I'm sure you'll find everything you need between these two solutions. If not just combine them.