Juha-Matti Tapio wrote:
.. except for the fact that it *dramatically* increases the effectiveness of your RBL's. At present, if a spammer's domain gets blacklisted, they'll just spoof someone else's. SPF will prevent that.SPF works only as long as spammers actually start to use it massively themselves (and I think I have read somewhere that many have already started to use it). If most servers start checking SPF, eventually all spammers will start to use valid SPF-configured envelope addresses. After that SPF does not help at all...
In essence, SPF would give the spammer "no place to run" when they get found out. I'm honestly curious to see what they do to counter it. My only guess is that they'll have to register a bunch of "throw-away" domains with names like "slk2l2jhldwfhsad9123jn.com", which they use to send out spam for a day and then abandon it.
- Joe
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