spf-discuss
[Top] [All Lists]

Re: Just how many of the boxen really *need* to be in the spf rr

2004-03-31 10:46:55
At 05:53 PM 3/30/2004, James H. Cloos Jr. wrote:
(I don't want to use ptr because I've seen endless spam -- mostly coming from Korean ipv4s -- where the ptr was falsely set to match the domain the mail claimed to be from....)

In theory, an SPF client should verify this with a forward lookup. If you have ptr in the SPF record for example.com, and someone tries to send mail to you from an IP address that claims to be host.example.com, the client should then look up host.example.com to see if it matches.

Kelson Vibber
SpeedGate Communications <www.speed.net>