My quick read on the important points to address...
First, SPF will not "solve" spam. Claims that it will are not helpful.
Acknowledge that SPF is one way to add accountability to SMTP transactions
for those who decide to use it, but SPF by itself will not stem the tide of
spam.
SPF will help some domain owners guard against forgery. There will still
be forgery, but those domain owners who choose to use SPF get a modicum of
protection. Spammers who want to get their message out to more readers may
start to avoid spoofing with SPF-protected domains and move on to the
millions of unprotected domains. Thus SPF is a "necessary but not
sufficient" first step toward addressing forgery and adding accountability.
For those domains that decide to use it, there is a BIG potential benefit:
fewer misdirected abuse reports. Misdirected abuse reports cost money to
process, and add nothing to the fight against spam. An SPF domain will
still get forged sometimes and some recipients will still get the message,
but the more we can encourage spammers to stop spoofing our domains, the
more we can focus on tackling real spam problems instead of dealing with
tons of misdirected reports.
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