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wmf
on June 20, 2008
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The future of email: From smtp to xmpp
SPF allows some verification of mail servers and some antispam systems will do an SMTP callback to verify that the sender address is a valid address.
bct
on June 20, 2008
[–]
How widely are those deployed? Can you get away with ignoring submissions from servers that don't have them set up?
dfranke
on June 21, 2008
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No, not even close. SPF is not a spam prevention measure. It's just a way of protecting innocent senders from being impersonated by spammers. DKIM does a better job at the same purpose.
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