Why SPF over PTR?
David Botham
DBotham at OptimusSolutions.com
Mon Nov 29 21:59:11 UTC 2004
bind-users-bounce at isc.org wrote on 11/29/2004 03:12:27 PM:
> I must not be understanding SPF correctly because I don't understand
> why it is better for preventing sender domain forgeries than doing a
> simple PTR lookup.
>
> Wouldn't a simple comparison of the sender's IP address to their
> domain name via a PTR record lookup be sufficient to check for
> forgeries? I realize that not everyone has PTR records, but more have
> PTR records than SPF records.
>
> What am I missing?
A PTR RR simply says that a given IP points to a certain host name. SPF
says which hosts may source mail on a domain by domain basis.
Dave...
>
>
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