From owner-freebsd-questions@FreeBSD.ORG Wed Dec 2 00:05:18 2009 Return-Path: Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EEE16106566C for ; Wed, 2 Dec 2009 00:05:18 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from asmtpout028.mac.com (asmtpout028.mac.com [17.148.16.103]) by mx1.freebsd.org (Postfix) with ESMTP id DC4A98FC1C for ; Wed, 2 Dec 2009 00:05:18 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; charset=us-ascii Received: from cswiger1.apple.com ([17.227.140.124]) by asmtp028.mac.com (Sun Java(tm) System Messaging Server 6.3-8.01 (built Dec 16 2008; 32bit)) with ESMTPSA id <0KU000AJF08TIK00@asmtp028.mac.com> for freebsd-questions@FreeBSD.ORG; Tue, 01 Dec 2009 16:05:18 -0800 (PST) From: Chuck Swiger In-reply-to: <20091202000313.GE99059@thought.org> Date: Tue, 01 Dec 2009 16:05:17 -0800 Message-id: <8441B02F-BA0B-4D64-A884-77E30DDB22F9@mac.com> References: <20091201230157.GA99062@thought.org> <9176F7CB-372D-4881-AB8E-FE1803AA9A0A@mac.com> <20091202000313.GE99059@thought.org> To: Gary Kline X-Mailer: Apple Mail (2.1077) Cc: FreeBSD Mailing List Subject: Re: How known? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Dec 2009 00:05:19 -0000 On Dec 1, 2009, at 4:03 PM, Gary Kline wrote: >> Most mail user agents have an option to enable "read receipts"; they use (or abuse) the DSN or MDN capabilities of the recipient's MTA or MUA. They are not a reliable signal that a human has seen the mail, although they can be used to confirm it at least got to the recipient's mail server or were processed by their MUA. > > What are DSN and MDN, please? Delivery Status Notification, Message Disposition Notification -- -Chuck