On Wed, 14 Jan 2004 17:40:15 EST, Keith Moore said:
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
confirmations for subscription requests with a MAIL FROM:<> specifically
so that if the request came from a duff address, the Listserv reply goes out
and bounces, it won't get a totally useless bounce message coming back at it.
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