Markus Stumpf wrote:
Sorry, this is not how SPF works.
A receiver could try to "enforce" it, but one of its strong
points is that it's a _voluntary_ system working without any
"worldwide deployment" FUSSP.
less than 0.1% of all domains worldwide
If the users of these domains don't get the tons of bounces
anymore they got before it's fine for all participants.
Even the evil third in this game can simply switch to one
of the remaining 99.9% domains, all participants are happy.
It's not a trick, it's SPF.
It will not stop spammers abusing cracked hosts on
broadband access.
True.
Port 25 blocks will do this.
IBTD. A zombie minus port 25 is still a zombie. SpamCast
pretends that blocking port 25 is an adequate replacement
of a proper abuse desk, but that's a lie.
MTAMARK can help do this without port 25 blocking.
Indeed, it could be used as input for DynIP BLs. Or for
SIQ servers. SIQ could support SPF or Sender-ID or wild
mixtures of RFCI cum MTAMARK times CSV modulo SPF.
Bye, Frank
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