> Example: > Received: from dadosoftware.com (dns2.dadosoftware.com [217.199.13.2]) -> > OK > > Received: from dadosoftware.com (unknown [217.199.13.2]) -> FALSE POSITIVE
I get timeouts on one of the servers (dns2.bkom.it) responsible to resolve 217.199.13.2. This may explain the inconsistent behaviour you're seeing (I wouldn't call it a false positive). -- Matthias