[Asrg] Re: Disaster looming: SPF

[Frank Ellermann <nobody at xyzzy.claranet.de>]

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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