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List:       james-dev
Subject:    RE: Check for valid RCPT before accept email
From:       "Noel J. Bergman" <noel () devtech ! com>
Date:       2006-08-31 23:40:53
Message-ID: NBBBJGEAGJAKLIDBKJOPKEOAKCAC.noel () devtech ! com
[Download RAW message or body]

> > Does it make sense to track how many valid & invalid addresses are
> > provided for a message, and allow a threshold to consider that spam?

> Hmm we could do so and reject such a message after the data.
> any other thoughts ?

Well, according to RFC 2821, 354 is not the only valid reply code to DATA:

   DATA
      I: 354 -> data -> S: 250
                        E: 552, 554, 451, 452
      E: 451, 554, 503

503 would be wrong, and I consider 451 (Requested action aborted due to a
local error) rather dubious, but 554 (Transaction failed) seems reasonable.

	--- Noel



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