Comment Re:Whitelisting is the only long-term answer (Score 1) 212
1) Reverse DNS (IP address to name) is generally controlled by network admins at the ISP/Backbone level.
2) Putting in some additional record (suggestions?) for each IP address indicating that it is a mail server and should be directly sending mail would be relatively easy.
3) If a receiving mailserver saw this was a trusted mailserver IP it could assign more trust to message (by lowering the spam score).
I don't think this would solve everything, but I am sure it would help. It puts a second qualified party, who is accustomed to dealing with customers and ip, in the position of legitimizing ip addresses that should be mail servers.
LLB
2) Putting in some additional record (suggestions?) for each IP address indicating that it is a mail server and should be directly sending mail would be relatively easy.
3) If a receiving mailserver saw this was a trusted mailserver IP it could assign more trust to message (by lowering the spam score).
I don't think this would solve everything, but I am sure it would help. It puts a second qualified party, who is accustomed to dealing with customers and ip, in the position of legitimizing ip addresses that should be mail servers.
LLB
