Marc Perkel wrote:
Daryl C. W. O'Shea wrote:
Marc Perkel wrote:
SPF is rather useless. Spammers can publish SPF records.
Guess what Marc, spammers can publish ANY DNS records! That includes
TXT records, type 99 (SPF) records, and your precious A and PTR records.
What spammers can't do is publish a forward confirmed RNDS that ends in
wellsfargo.com, which would be a listed domain.
WTF does whitelisting a domain have to do with whether or not a spammer
can publish DNS records.
From a DNS "forgeability" standpoint "your" method of checking FCrDNS
and checking for SPF_PASS are on equal ground.
Daryl
