Return-Path: X-Original-To: dmarc@ietfa.amsl.com Delivered-To: dmarc@ietfa.amsl.com Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A1D0D1A007F for ; Thu, 21 May 2015 10:57:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-0.001] 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 BPK2sBwtV9Qr for ; Thu, 21 May 2015 10:57:09 -0700 (PDT) Received: from mail-wi0-x22e.google.com (mail-wi0-x22e.google.com [IPv6:2a00:1450:400c:c05::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 93B881A0191 for ; Thu, 21 May 2015 10:56:28 -0700 (PDT) Received: by wicmx19 with SMTP id mx19so23306282wic.0 for ; Thu, 21 May 2015 10:56:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=2sFF4Ut4VmDr5lYww+DO2S1IiT7IgT4rNbX9n7kTtrI=; b=ve8dtUlWuRavvQcdkjk8vQzA5O0agSJxcmumHeDh3ex+sgltMhTwJ+wItzi/yjHTbB 7zhMcJztOmzu1+a0OY0tQQTWp9y0DPXpYQDWXzM8mReBjW6IpY0/swZ1vHmlsg9wjqvQ BpkNaa0ibW5aNlg4ZG+dILM2NhdbgX+zBq4Dble39qiTTc1UP1MHyLNF5WT865oakLzG ESLqHbkTFKwyYZRFuHwOMu4AJeGrngCSoErEAGzn0YOTEm1wjLPCIxy+I5ERjz+TYqlc UpUuc6TzuOJvtwf1mrdbi+NR1cOwR7J+JZ40FlqTXBgfMK8Nk5w2If121lxV7EGuinZI tqmQ== MIME-Version: 1.0 X-Received: by 10.194.61.208 with SMTP id s16mr7503547wjr.135.1432230986572; Thu, 21 May 2015 10:56:26 -0700 (PDT) Received: by 10.27.170.134 with HTTP; Thu, 21 May 2015 10:56:26 -0700 (PDT) In-Reply-To: References: <20150520032528.63043.qmail@ary.lan> <555C75AC.3060502@isdg.net> Date: Thu, 21 May 2015 10:56:26 -0700 Message-ID: From: "Murray S. Kucherawy" To: Terry Zink Content-Type: multipart/alternative; boundary=047d7b86d3e630e97c05169b43ea Archived-At: Cc: "dmarc@ietf.org" , Hector Santos Subject: Re: [dmarc-ietf] Weaker single author signature X-BeenThere: dmarc@ietf.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Domain-based Message Authentication, Reporting, and Compliance \(DMARC\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2015 17:57:11 -0000 --047d7b86d3e630e97c05169b43ea Content-Type: text/plain; charset=UTF-8 On Thu, May 21, 2015 at 10:27 AM, Terry Zink wrote: > > Not sure how other big mailers would do it, but I would think it would be > similar (especially Gmail). > > > At Facebook there are no longer any email-enabled mailbox services, so it's not among the more interesting of the big cases except for the scale it handles. In terms of email it's just a forwarding service now. So inbound, it would check v=1 and v=2 and DMARC, and then hand the whole package off to internal analysis machinery for a verdict. If the message survives, it's relayed; then, outbound, it would sign with v=1 and be done because it's unlikely anything past that is an MLM. Gmail, AOL, and Yahoo would be interesting to hear about. -MSK --047d7b86d3e630e97c05169b43ea Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
On Thu, May 21, 2015 at 10:27 AM, Terry Zink <= tzink@exchange.microsoft.com> wrote:

Not sure how other big= mailers would do it, but I would think it would be similar (especially Gma= il).



At Facebook there are no lon= ger any email-enabled mailbox services, so it's not among the more inte= resting of the big cases except for the scale it handles.=C2=A0 In terms of= email it's just a forwarding service now.=C2=A0 So inbound, it would c= heck v=3D1 and v=3D2 and DMARC, and then hand the whole package off to inte= rnal analysis machinery for a verdict.=C2=A0 If the message survives, it= 9;s relayed; then, outbound, it would sign with v=3D1 and be done because i= t's unlikely anything past that is an MLM.

Gmail, AOL= , and Yahoo would be interesting to hear about.

-MSK
--047d7b86d3e630e97c05169b43ea--