Re: 2821bis and address rewriting (was: Re: Fixing graylisting [was TBR]

On Sun, 18 Nov 2007 22:13:35 EST, John C Klensin said:
> (2) I fear someone coming along and saying "well, I know how to
> avoid mail loops, so that statement doesn't apply to me".  There
> are reasons for not messing with null return paths, including
> their being an important clue for various automated programs,
> that has nothing to do with mail loops (at least directly).
Amen to that.  Over the years, I've had to explain to a *lot* of people that
"No, that piece of mail with MAIL FROM:<> isn't a bounce message. Yes, it's
correct".       Seems people have problems wrapping their tiny little brains
around the idea that <> is useful for other things - in this particular case,
it was a mailing list manager that sent out all the "Please reply to this
message to confirm your request" messages with <> specifically because it
did *not* want to hear back if there was a problem (as the request would just
time out all by itself anyhow).

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