[Dshield] Spam 101 Question

Valdis.Kletnieks@vt.edu Valdis.Kletnieks at vt.edu
Mon Aug 8 14:46:03 GMT 2005

On Mon, 08 Aug 2005 07:39:34 PDT, Mike Easter said:

> Many servers will give such an apparently positive result for a test and
> /not/ relay the mail.  A positive relay test is receiving the test
> message, not seeing the transaction accepting the message.

Of course, having issued a '250 OK' after the data phase, if you discover that
the RCPT TO: can't be delivered, you're required to send a bounce to the MAIL FROM,
which is likely to be forged (causing backscatter) or totally bogus (causing a
double bounce to the postmaster).

And just throwing the bounce on the floor is anti-social as well....
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