A false positive is a message that has been flagged as spam but
is no spam.
There can be different reasons:
- the regular expression filter hit
(f.x. you have a dirty talk with... hrmpf, a new acquaintance that
is not in your Auto-Whitelist )
- the DNSBL is too aggressiv
It is difficult to avoid false positives. You can check the results
of all known DNSBLs with the 'Check DNSBLs' function .
Sidenote: I read variouse mailing lists, some are tech related, some
are not. In some of these I have a huge volume of false positives
only coming from DNSBLs. In others I have none.