Last Call: <draft-klensin-smtp-521code-05.txt> (SMTP 521 and 556 Reply Codes) to Proposed Standard

The IESG <> Thu, 05 March 2015 20:02 UTC

Return-Path: <>
Received: from localhost ( []) by (Postfix) with ESMTP id C2E3B1A8977 for <>; Thu, 5 Mar 2015 12:02:39 -0800 (PST)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -101.9
X-Spam-Status: No, score=-101.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, USER_IN_WHITELIST=-100] autolearn=ham
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id 1dWDvP2U0O0n for <>; Thu, 5 Mar 2015 12:02:38 -0800 (PST)
Received: from (localhost [IPv6:::1]) by (Postfix) with ESMTP id 8BFDF1A892B for <>; Thu, 5 Mar 2015 12:02:24 -0800 (PST)
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: The IESG <>
To: IETF-Announce <>
Subject: Last Call: <draft-klensin-smtp-521code-05.txt> (SMTP 521 and 556 Reply Codes) to Proposed Standard
X-Test-IDTracker: no
X-IETF-IDTracker: 5.12.0.p2
Auto-Submitted: auto-generated
Precedence: bulk
Message-ID: <>
Date: Thu, 05 Mar 2015 12:02:24 -0800
Archived-At: <>
X-Mailman-Version: 2.1.15
List-Id: "IETF announcement list. No discussions." <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Thu, 05 Mar 2015 20:02:39 -0000

The IESG has received a request from an individual submitter to consider
the following document:
- 'SMTP 521 and 556 Reply Codes'
  <draft-klensin-smtp-521code-05.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits
final comments on this action. Please send substantive comments to the mailing lists by 2015-04-02. Exceptionally, comments may be
sent to instead. In either case, please retain the
beginning of the Subject line to allow automated sorting.


   This memo defines two Simple Mail Transfer Protocol (SMTP) reply
   codes, 521 and 556.  The 521 code was originally described in an
   Experimental RFC in 1995 and is in wide use, but has not previously
   been formally incorporated into SMTP.  The 556 code was created for
   RFC-nullMX.  These codes are used to indicate that an Internet host
   does not accept incoming mail at all (not just under particular

The file can be obtained via

IESG discussion can be tracked via

No IPR declarations have been submitted directly on this I-D.