Senders without reverse DNS...

[listman@cpr.cor.neva.ru (Alexey Lobanov)]

Hello.

I have a strong feeling that any SMTP originators trying to send me a 
mail from a host without proper reverse DNS must be rejected. This 
feeling is supported with significant part of spam headers.

What should I say to smtpserver to make him to reject connections 
from hosts being absent in DNS?

Another aspect of same issue. It seems to be good idea to reject SMTP 
from hosts which are reversed to "*dialup*", etc - like MAPS DUL 
does. So, smtpserver should have some policy related to resolved 
domain names, together with existent numerical IP filtering.

Regards,
Alexey