IETF Logo Mail Archive

Re: [Emailcore] encodings, was Ticket #14: G.7.8. Review different size limits

John Levine <johnl@taugh.com> Sat, 17 July 2021 22:17 UTC

Return-Path: <johnl@iecc.com>
X-Original-To: emailcore@ietfa.amsl.com
Delivered-To: emailcore@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7C1AF3A2434 for <emailcore@ietfa.amsl.com>; Sat, 17 Jul 2021 15:17:12 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.799
X-Spam-Level:
X-Spam-Status: No, score=-2.799 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=iecc.com header.b=Tw3jWtQh; dkim=pass (2048-bit key) header.d=taugh.com header.b=s2e/TEdx
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AWWEgTf757tZ for <emailcore@ietfa.amsl.com>; Sat, 17 Jul 2021 15:17:05 -0700 (PDT)
Received: from gal.iecc.com (gal.iecc.com [IPv6:2001:470:1f07:1126:0:43:6f73:7461]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 847933A2432 for <emailcore@ietf.org>; Sat, 17 Jul 2021 15:17:05 -0700 (PDT)
Received: (qmail 45363 invoked from network); 17 Jul 2021 22:17:04 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=iecc.com; h=date:message-id:from:to:cc:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:cleverness; s=b131.60f356e0.k2107; bh=dQJPnCtCtXckJT9ViKXX9cQDGvLwro/fGtZoFDaSfEc=; b=Tw3jWtQhW73MhmDmC5sLeIsSrMRak57CCIkwKRETss5J+QXSP3KPh1eXdSw23ZJ0lA2DXB+duCXSypst3cwrIDuoGn5MHws4KpbwAY2IaDDfki0uQHmi+KKVgu+5YrxJuOqtIMWSJvcWGTlu2WYnXH9tOJmG/fQm7OYLdDhVP9yF2O+wfIQ+dmDK/kIct5vGzrXYtreFVTXN6MgCITwWaAJyCaokjmrmJOyU1WhOhn+psBqmTTMmBMzIdw20tpdgQX3QwtK4H/Cu9ABnUbqT5B5bXBkeoPg3DspUzMWByqQ+ipHVfWcH5OdTM6HMusQ5VXWOZ5k7Z+UcYYczIEeBXg==
DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=taugh.com; h=date:message-id:from:to:cc:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:cleverness; s=b131.60f356e0.k2107; bh=dQJPnCtCtXckJT9ViKXX9cQDGvLwro/fGtZoFDaSfEc=; b=s2e/TEdxd24DYsRTae8DEwia9VAL87xLUWW2PKNQxe4IvpD595Eo9s3xJ6aD4fQ0qX6GOufz3SO1ARZucHwoyCfl4kk0OrmWx5N0UBTp8pdiYjR1JF+tmhHTyt1we+67w7/Rxx2VsmjpiU01h7O40du+u8lsCCkLz9mHX162Y395mttDO/gVCFl2CGPRiq9tN60fJo9NBWaGHA4F7ppCKeOxXuasPcW8YQQwv632a0AsiJ09NJzE2pLr99HiXvPBvutOFjZXegc2+OIfob/teP+uBN39IsbzBurMakfyLUriW8ahCalbT6CPdHsfBM9EfnwrsK4E80KJVVILwoWSBg==
Received: from ary.qy ([IPv6:2001:470:1f07:1126::78:696d:6170]) by imap.iecc.com ([IPv6:2001:470:1f07:1126::78:696d:6170]) with ESMTPS (TLS1.2 ECDHE-RSA AES-256-GCM AEAD) via TCP6; 17 Jul 2021 22:17:03 -0000
Received: by ary.qy (Postfix, from userid 501) id 0CBF924AABD7; Sat, 17 Jul 2021 18:17:02 -0400 (EDT)
Date: Sat, 17 Jul 2021 18:17:02 -0400
Message-Id: <20210717221703.0CBF924AABD7@ary.qy>
From: John Levine <johnl@taugh.com>
To: emailcore@ietf.org
In-Reply-To: <20210717181358.sHnj6%steffen@sdaoden.eu>
Organization: Taughannock Networks
X-Headerized: yes
Cleverness: minimal
Mime-Version: 1.0
Content-type: text/plain; charset="utf-8"
Content-transfer-encoding: 8bit
Archived-At: <https://mailarchive.ietf.org/arch/msg/emailcore/KapvpbGCAztsXsPM-TfYN0Ux7J4>
Subject: Re: [Emailcore] encodings, was Ticket #14: G.7.8. Review different size limits
X-BeenThere: emailcore@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: EMAILCORE proposed working group list <emailcore.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/emailcore>, <mailto:emailcore-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/emailcore/>
List-Post: <mailto:emailcore@ietf.org>
List-Help: <mailto:emailcore-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/emailcore>, <mailto:emailcore-request@ietf.org?subject=subscribe>
X-List-Received-Date: Sat, 17 Jul 2021 22:17:13 -0000

It appears that Steffen Nurpmeso  <steffen@sdaoden.eu> said:
>Jeremy Harris wrote in
> <7167164a-5c14-f6f2-4692-06da2506d158@wizmail.org>:
> |On 17/07/2021 17:16, Steffen Nurpmeso wrote:
> |> Your MUA created the according MIME headers, but whether it used
> |> the 8BITMIME SMTP extension when passing this over to a MTA, that
> |> is here the question.
> |
> |See https://cr.yp.to/smtp/8bitmime.html for one opinion, written quite
> |a long time ago.  Exim has been following that for the last nine years.
>
>I have to say i never quite understood the "an email message must
>be human readable text" approach.

djb wrote that in 1998 when MUAs that support MIME were a lot less ubiquitous
than they are now, and I don't know anyone who objects to base64 encoding
of PDFs and JPEGs.  But 7bit MTAs were gone in 1998 and they're even more
gone now so there is no point in encoding anything that is an 8 bit extended
ASCII like UTF-8 or ISO-8859-x.

R's,
John

v2.23.0 | Report a Bug | By Email