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RFC 5321, "Simple Mail Transfer Protocol", October 2008

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app

Errata ID: 1543
Status: Held for Document Update
Type: Technical

Reported By: Brett Watson
Date Reported: 2008-10-08
Held for Document Update by: Pete Resnick

Section 3.8 says:

   SMTP clients that experience a connection close, reset, or other
   communications failure due to circumstances not under their control
   (in violation of the intent of this specification but sometimes
   unavoidable) SHOULD, to maintain the robustness of the mail system,
   treat the mail transaction as if a 451 response had been received and
   act accordingly.

It should say:

   SMTP clients that experience a connection close, reset, or other
   communications failure due to circumstances not under their control
   (in violation of the intent of this specification but sometimes
   unavoidable) SHOULD, to maintain the robustness of the mail system,
   treat the mail transaction as if a 421 response had been received and
   act accordingly.

Notes:

SMTP clients are told to act as though a 451 response ("Requested action aborted: local error in processing") had been received when context clearly indicates that a 421 response ("Service not available, closing transmission channel") was intended.

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