On Mon, Sep 02, 2002 at 11:24:24PM -0400, Steven Christensen wrote:
> Hmm... that's interesting. If this is a standard (and I did indeed
> find it in RFC 2421), then it looks like BellSouth is doing something
> non-standard. They are rejecting DSN/NDN messages to their servers.
> Are they allowed to do this (per RFC) ?
No.
> Would there be a reason for this? Does having this enabled leave a
> spam hole others could exploit?
1) to avoid a bounce storm after a bunch of mail was sent with a return
envelope pointed to you (should only really be used as a very last
resort)
2) some misguided attempt to avoid spam (not that it really helps that much
anyway)
3) Users of the stupid X1 ESMTP
I point the affected server admins to
http://marc.merlins.org/netrants/nullenvelope.txt
and typically let exim callbacks bounce all their mails until they fix it
(or just bounce all their mails if they don't fix it)
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems & security ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | Finger marc_f@??? for PGP key
