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> The new engine uses a drastically new way of catching spam, which is very
> successful, both for catch-rate and false positives

Though the catch rate has been very good, I disagree with the false
positives statement. In earlier versions, we ran almost all of the Extreme
scripts and went some weeks without a single person releasing a message from
their quarantine. I would have to look back at the records, but I believe we
went months without a single true false positive report.

When we upgraded to ModusMail 3, we enabled the extreme script (foolish of
us in hindsight). We had thousands of false positives and hundreds of
quarantine releases. After a day, we clocked it down to strong. Now, we're
seeing between 25 and 50 quarantine releases a day. Most are not true false
positives, but many are.

We may have to switch the default server setting to Normal from Strong
because of the high false positive rate. This is not necessarily a bad
thing. However, to those people who haven't yet upgraded, you should be
warned that the old concept of Normal/Strong/Extreme is radically different
than the new.

The new system generates a lot more false positives (at least in the Strong
and Extreme settings) than earlier versions, something that we didn't
realize going into the upgrade. Knowing this ahead of time would have
prevented a lot of headaches last week.

-Ben


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