Devdas Bhagat wrote:
But .forward is still used and SPF breaks that.
SPF fixes it. 551 is an error. 251 was an exception, a
courtesy, a hack, it worked with reverse source routes,
sometimes. It was never meant to be used generally and
forever, otherwise there would be no 251 / 551.
It hurts millions of innocent bystanders with tera bytes
of forgeries and the resulting bounces / challenges / out
of office and whatever else mails.
Today .forward is the worst loophole in SMTP, worse than
open relays. And SPF closes it. It's a feature, no bug.
Bye, Frank
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