On Wed, 14 Jan 2004 Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu wrote:
> > Very little spammers use a NULL address because it
> > reinforces further DSN checking that will fail their transaction.
>
> Of course, systems that do such checking are broken. Nothing says that a
> NULL address signals a DSN.
And in fact, LSoft's Listserv product does this. It will send
things like cookie confirmations for subscription requests with a
MAIL FROM:<>...
And I'll go a step further. I've been doing this for years (way before
spam was the problem it is today) not only with confirmation requests
but almost all auto-responder messages.
You commented about the failed message being useless but more to the
point, just what action would you take if you got one? I suppose you
could log it but to what end?
I've always used the NULL MAIL FROM: because to do otherwise
unnecessarily uses resources.
Jim