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Re: CBV systems - was Re: SMTP Extensions - proper peply code for disabled commands

2004-01-14 20:41:54
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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