I've read some posts on this list about SOFTFAIL. I agree with
most of them saying it is a debugging feature. As such, it
leaves something to be desired, doesn't it? I'd propose the
following addition:
If example.com says "~ip4:1.2.3.4", then a receiving server
should send a DSN to postmaster(_at_)example(_dot_)com saying something
like
Hey,
someone did actually manage to send a message from 1.2.3.4
Here are the relevant headers...
Nearly a breakpoint, isn't it?
Possibly a mandatory string (e.g. "SPF: SOFTFAIL") either in the
subject or in some other header may help postmasters to properly
collect their debug messages.
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