[EAI] SMTPUTF8 and 8BITMIME

Franck Martin <fmartin@linkedin.com> Wed, 15 April 2015 09:24 UTC

Return-Path: <fmartin@linkedin.com>
X-Original-To: ima@ietfa.amsl.com
Delivered-To: ima@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7B7251B33C0 for <ima@ietfa.amsl.com>; Wed, 15 Apr 2015 02:24:31 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: 0.688
X-Spam-Level:
X-Spam-Status: No, score=0.688 tagged_above=-999 required=5 tests=[BAYES_50=0.8, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_RP_MATCHES_RCVD=-0.01] autolearn=ham
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 rWcHvv8Tawdi for <ima@ietfa.amsl.com>; Wed, 15 Apr 2015 02:24:30 -0700 (PDT)
Received: from mail522.linkedin.com (mail522.linkedin.com [108.174.6.122]) (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 6D9051B33C4 for <ima@ietf.org>; Wed, 15 Apr 2015 02:24:29 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linkedin.com; s=proddkim1024; t=1429089867; bh=RqNGk/Uh99z9/DfNs9w3suq0G3fXuGvgxNrRyfyLZCo=; h=From:To:Subject:Date:Content-Type:MIME-Version; b=qdSVXtRviqXxgkkPauiLwfMIWXvOddeqPvhUktKi/nWH0tDRiIUjTuM8uf7z1FUor TWd9kN/cInpE0ElEFFA5l+22kZrhkyTj/NjvUZzBGOTSy6aO9+LSBdm8Ia1NHCBwWq I6gtDqxuVSm8Bq8L2OqVawhtXGXF/rNG3oCmg+jY=
Authentication-Results: mail522.prod x-tls.subject="/C=US/ST=California/L=Mountain View/O=LinkedIn Corporation/CN=*.corp.linkedin.com"; auth=pass (cipher=RC4-SHA)
Received: from [172.18.129.50] ([172.18.129.50:42464] helo=eat1-mav01.corp.linkedin.com) by mail522.prod (envelope-from <fmartin@linkedin.com>) (ecelerity 3.6.7.46655 r(Core:3.6.7.0)) with ESMTPS (cipher=RC4-SHA subject="/C=US/ST=California/L=Mountain View/O=LinkedIn Corporation/CN=*.corp.linkedin.com") id 60/A3-17681-B4E2E255; Wed, 15 Apr 2015 09:24:27 +0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linkedin.com; i=@linkedin.com; q=dns/txt; s=proddkim1024; t=1429089867; x=1460625867; h=from:to:subject:date:message-id:content-id: content-transfer-encoding:mime-version; bh=RqNGk/Uh99z9/DfNs9w3suq0G3fXuGvgxNrRyfyLZCo=; b=HibY1Kpd6MMW+zw+wHk9EhmY2jflxmUeOS7QQT03NwYgZRGm1XS5nnRC 2P/BlB4cRTyyP44mT11oxC7yKgpsX4MCZxKsL/56us63ESRQerX9HXuGr QKC8GR60RdmIBlOjaavcJmvHu3y+qmWUqFYwwy4QR6k41khdfa/6p7JQ1 s=;
X-IronPort-AV: E=Sophos;i="5.11,581,1422950400"; d="scan'208";a="4588817"
Received: from LVA1-MB01.linkedin.biz ([fe80::9ca6:542a:3dc7:d0fd]) by LVA1-HUB02.linkedin.biz ([::1]) with mapi id 14.03.0195.001; Wed, 15 Apr 2015 02:24:27 -0700
From: Franck Martin <fmartin@linkedin.com>
To: ima <ima@ietf.org>
Thread-Topic: SMTPUTF8 and 8BITMIME
Thread-Index: AQHQd133ZFi2gGl62kC6RN+BKpLDPw==
Date: Wed, 15 Apr 2015 09:24:25 +0000
Message-ID: <3D9223A5-135E-4F43-B814-EB7BE51D207C@linkedin.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-originating-ip: [172.29.36.245]
Content-Type: text/plain; charset="utf-8"
Content-ID: <DDFF221238681E47A0C1BAA849646D6E@linkedin.com>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
Archived-At: <http://mailarchive.ietf.org/arch/msg/ima/7lxFPVkllYFKF6gYZe25I47XOf8>
Subject: [EAI] SMTPUTF8 and 8BITMIME
X-BeenThere: ima@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "EAI \(Email Address Internationalization\)" <ima.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ima>, <mailto:ima-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/ima/>
List-Post: <mailto:ima@ietf.org>
List-Help: <mailto:ima-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ima>, <mailto:ima-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 15 Apr 2015 09:24:31 -0000

it seems that a few MTA can be thrown at an email with a EAI RFC5321.mailfrom and pass the message fine to other MTA or local delivery, as long as the MTA supports 8BITMIME and the RFC5321.rcptto is a standard email address. 

replying to such email is a challenge, but it does not seem any MTA or MUA (with 8BITMIME) will complain because the RFC5321.from is an EAI...

What’s your experience?