Antispam solutions

[Phillip Salzman]

Hello,

I've been researching several different vendors for antispam over the last
few weeks.  It seems many of the major commercial players (Brightmail,
Sophos) charge per-user rates that make it difficult to the bottom line.

One of the goals is to prevent the mail from actually hitting our backend
Qmail systems, but at the same time give users the ability to weed through
their messages in a quarantine.  Initially we wanted to deploy Spam Assassin
but haven't found any quarantine method available.

So - my question is what some of you were using for ISP-based antispam, and
do you know of a user-manageable quarantine for SA?  We have roughly 90k
users and 11k domains.

Thanks for any input or critiques you may have...


--
Phillip Salzman
http://www.sysctl.net/phill/