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Re: Question for the gurus :-)

"Nick Silberstein" <nick@tpd.com>
> Hi all,
> I'm curious as to why "MAIL FROM: <>" should be/has to be supported.

To avoid bounce loops.  It means, "do not send any error report
whatsoever for this message" and is typically used for error reports.

> In particular I am interested in why it should be/could be used by mailing
> list software.

It shouldn't.  Some lazy list managers use it, I guess.  Easier than
removing invalid addresses from the list.