Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu wrote:
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
Or rather, it is useful for exactly its primary purpose, which is to signal
that error messages are not to be returned.
The problem is that we have overloaded that construct with more semantics,
such as "this is a bounce message" and then done it inconsistently.
Almost makes one wish that real bounce messages were distinguished by
something other than the 2821.mailfrom address...
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net