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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