From owner-freebsd-questions@FreeBSD.ORG Tue Dec 1 23:15:26 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 6197E1065670 for ; Tue, 1 Dec 2009 23:15:26 +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 502A78FC0C for ; Tue, 1 Dec 2009 23:15:26 +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 <0KTZ0079UXXP3L30@asmtp028.mac.com> for freebsd-questions@FreeBSD.ORG; Tue, 01 Dec 2009 15:15:26 -0800 (PST) From: Chuck Swiger In-reply-to: <20091201230157.GA99062@thought.org> Date: Tue, 01 Dec 2009 15:15:25 -0800 Message-id: <9176F7CB-372D-4881-AB8E-FE1803AA9A0A@mac.com> References: <20091201230157.GA99062@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: Tue, 01 Dec 2009 23:15:26 -0000 On Dec 1, 2009, at 3:02 PM, Gary Kline wrote: > hey, mail gurus, how is this possible? thru evolution:: > > This is a receipt for the mail you sent to > at 12/1/2009 12:43 PM > > This receipt verifies that the message has been displayed on the > recipient's computer at 12/1/2009 1:55 PM 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. Knowledgeable mail admins tend to disable them as being needlessly intrusive and wasteful of resources. Regards, -- -Chuck