I don't see anything about mod_security, php hardening, or internal spam prevention.
Why PLESK has not incorporated a real anti-spam/bulk email catching script yet is beyond my comprehension. It is so eazy to pipe email to a script which replaces the qmail sendmail binary which limits outgoing email based on a threshhold set by the admin. If the sender attempts to send more email within a certain time span, then the script sends all the emails into a database, turns off email and scripting support for the domain and sends a notification to the admin about the abuse. You know how many times you have had spammers signup and then a day or two later try to send 50,000 emails out of your nice little box. Then your server IP's get blacklisted and you have to track the spammer down manually, terminate the account and then contact all the admins from the blacklists and RBLS to get your IP's removed. During this whole time you have hundreds of customers freadking out becuase they cannot send any email.
There used to be a small script named mailmon which was written by the guys at
http://webhosting-tools.com/view.cgi/MailMon which has this exact functionality. I used to use it on plesk servers without much trouble installing it.
You would think that the programmers working for PLESK would be able to easily incorporate this into PLESK, but again it just doesn't matter about fixing the propblem that we have all experienced over the past 5 years, it is more important to bring out more flashy features which are basically useless when the server is going down due to expoits and spammers filling your email queue to 80,000.
PLEASE GET BACK TO BASICS AND ADD SOME SECURITY Features beside just checking for trojans.