[Dovecot] Ok, I've given up

[Jakob Curdes]

>> Spammers are working every day to cause more abuse. Postmasters are
>> trying to stay ahead of them, but we still see that over 90% of all
>> traffic to port 25/tcp is abuse.
>>
>>      
Hmm, I would rather estimate it to around 99% on our multi-domain 
mailserver, including the connections we deny at the SMTP level on the 
basis of rules like "deny systems that do not know their hostnames" or 
"deny systems that cannot do a proper SMTP greeting".

Cheers,
Jakob Curdes