I just took a look at my SPAM filter stats and each user account varies from 80% through to 99% of received mail is SPAM. Overall average is 89%.
Now the 99% is on a low usage user that has probably never given their name to any web site, user group or internet marketer. It's been harvested. She gets 20% more spam than I do and my name is plastered in quite a few places.
Anyway, the point was that my Spam filter (SpamFighter SMTP) was down for a few days while I moved some servers around and I was FLOODED with crap. It proved it's worth when it came back on line.
Is the rest of the world suffering or do you all have good Spam filters?
Bart, do you tune your IMF? I find Exchange 2003 SP2 IMF (on Windows Server 2003 R2 SBS) is working great. And I also use IMF Companion to monitor spam/filtered folder to "pickup" false positive and send them over to the Pickup folder for deliver to mailboxes.
The IMF Companion uses the collected spam/filtered folder to build its spam confidence, and you can also add whitelist straight to IMF Companion, so it can parse the false positive correctly. This is done after Exchange 2003's IMF filteration which I also have set up to use SpamAssassin service to monitor all incoming emails.
My IMF settings are moderately restrictive, so it filtered out a lot of baddies and so far had very little or no false positive.
However, over the last 3 days, i noticed there's been a surge in spam, all caught by IMFs.
My experience with IMF was when I was supporting 15-20 SBS2003 sites and there was not the time for this fine-tuning as I was mainly in a break-fix role. I will play around with IMF some more at the end of the year.