Alain Knaff wrote:
The downside of checking HELO always is that it may be more permissive
than checking From. A spammer wanting to joe-job somebody can set up
his MTA to use a truthful HELO (so that it passes SPF), and still lie
in the MAIL FROM: (so that bounces go "back" to an unsuspecting
victim).
I read somewhere that large amount of spam coming from hijacked PCs.
What about these PCs? Who will setup SPF for these PCs?
z2
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