Why SPF over PTR?

Ludwig77 gregrjones at yahoo.com
Mon Nov 29 20:12:27 UTC 2004

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?

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