Dr. Ernst Molitor [molitor(_at_)uni-bonn(_dot_)de] wrote:
would you care to describe to me why spf is at all necessary if spam
traps are this efficient? After all, blacklists have existed for quite a
while, and still, ever so many spams are circulated.
If spam mails would originate from spf-conforming "spam domains" run by
the bad guys, what advantage would spf buy in spam avoidance?
It's by far easier (and quicker) for a spammer to change his own mail server's
IP address (not even talking about IPv6 addresses) than to register a new
domain. SPF makes domain-based blacklisting a possibility.
Besides, SPF prevents sender address domain forgery, so when a spammer uses a
3rd party mail server (open relays, cracked account, whatever), he'd have to
use that server's domain name as the return path for his mails, which makes it
easier for people to report him.
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