421 4.3.0 deliver: Trying to unput wrong character

[Mikhail T.]

On 24.07.2017 10:41, Merlin Hartley wrote:
> NUL characters are not permitted in e-mails …
> https://helpdesk.pscs.co.uk/690163-Data-stream-contained-NUL-character
>
> As the RFC for IMAP states:
> https://tools.ietf.org/html/rfc3501#section-9
> (3) The ASCII NUL character, %x00, MUST NOT be used at any time.
But the message did go through sendmail...

Ken Murchison wrote:
> What is the Content-Transfer-Encoding of the email? Was the message 
> Base64 encoded, or is the PNG included as raw binary data? 
Raw... Here are the full headers (the first line -- the From_ -- is 
removed by sed before feeding the rest into deliver):

     From mi at EXAMPLE.com  Mon Jul 24 00:53:00 2017
    Received: from narawntapu.narawntapu (localhost [127.0.0.1])
             by narawntapu.narawntapu (8.15.2/8.15.2) with ESMTPS id
    v6O4r05T003160
             (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384
    bits=256 verify=NO)
             for <mi at narawntapu.narawntapu>; Mon, 24 Jul 2017 00:53:00
    -0400 (EDT)
             (envelope-from mi at narawntapu.narawntapu)
    Received: (from mi at localhost)
             by narawntapu.narawntapu (8.15.2/8.15.2/Submit) id
    v6O4r0c9003159;
             Mon, 24 Jul 2017 00:53:00 -0400 (EDT)
             (envelope-from mi)
    Date: Mon, 24 Jul 2017 00:53:00 -0400 (EDT)
    Message-Id: <201707240453.v6O4r0c9003159 at narawntapu.narawntapu>
    From: Cron Daemon <mi at EXAMPLE.com>
    To: mi at narawntapu.narawntapu
    Mime-Version: 1.0
    Content-Type: image/png; charset=binary
    Content-Transfer-Encoding: 8bit
    Subject: Cron <mi at narawntapu> cat foo.png

Should sendmail have re-encoded with something other than 8bit? I don't 
like doing that, because it increases the filesizes to no obvious 
benefit... Thanks!

    -mi

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