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From: "D. J. Bernstein" <djb@cr.yp.to>
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To: drums@cs.utk.edu
Subject: smtpupd-09 requires detailed reply code inspection
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> message data MUST NOT be sent unless a 354 reply is received.

This requirement prohibits the behavior of many existing clients.

If a server (in violation of RFC 821) sends (e.g.) a 387 reply, these
clients will (as encouraged by RFC 821) treat 387 the same way as 354.

Fix: ``message data MUST NOT be sent if the reply to DATA begins with 4
or 5.''

---Dan