On Wed, May 9, 2012 at 4:01 PM, David <d...@fiteyes.com> wrote: > Re: Giving away the secrets of 99.3% email delivery > > 1. Constantly monitor spam blacklists. We have a set of Nagios alerts that regularly check if we’re listed on any delivery blacklists, and whenever they go off we take whatever corrective action we need to get back off the blacklist. > 2. Have valid SPF records. Don’t impersonate your users. When running a web app like Basecamp, which sends email that are generated by another user, it can be tempting to send the email from that user (e.g., so that a comment I wrote on Basecamp would appear to come from noah at 37signals dot com), which might make people feel more comfortable. Unfortunately, this is a surefire way to end up on spam lists, since you’ll likely be sending from an IP address that does not have the valid SPF records. And chances are, if the user’s domain does have an SPF record, it doesn’t include your application’s IP. > 3. Sign the mail! DKIM and Domain Keys. Yahoo and Gmail both score signed email higher. > 4. Dedicated and conditioned email sending IPs. > 5. Configure reverse dns entries. Most of the “big boys” won’t accept mail from your servers if your reverse dns entries don’t match. You might need your IP provider to help with setting up these records. > 6. Enroll in feedback loops. We haven’t automated our parsing of feedback, but a daily / weekly review of feedback loop emails helps us know when there’s an unhappy user, or other problem. Too many complaints and you’ve got trouble.
I started by setting up an SPF record (#2 on the list above). However, shortly after setting it up, we got a bounce with this reason: SPF MAIL FROM check failed: [MAIL_FROM] I searched a bit and came across things like this: http://comments.gmane.org/gmane.org.user-groups.linux.new-zealand.general/34245 But nothing I found answered my questions. Looking at the headers of the bounced message, I note: Received-SPF: pass (domain of lists.example.com designates 10.10.10.99 as permitted sender) X-Originating-IP: [10.10.10.99] That would seem to indicate things are OK, but maybe X-Originating-IP isn't the line I need to be looking at... I'm not sure what [MAIL_FROM] (in the SPF check failed line) matches in the email header. Also, I note: X-YahooFilteredBulk: 10.10.10.99 <-- what does "X-YahooFilteredBulk" mean? And there is another value for this field. X-Originating-IP: [76.21.140.158] These are the headers of the bounced message: Subject: Failure Notice Sorry, we were unable to deliver your message to the following address. <recipi...@destination.com.br>: Remote host said: 550 5.7.1 SPF MAIL FROM check failed: [MAIL_FROM] --- Below this line is a copy of the message. Received: from [72.30.22.79] by nm1.bullet.mail.sp2.yahoo.com with NNFMP; 09 May 2012 21:51:02 -0000 Received: from [68.142.200.224] by tm13.bullet.mail.sp2.yahoo.com with NNFMP; 09 May 2012 21:51:02 -0000 Received: from [66.94.237.102] by t5.bullet.mud.yahoo.com with NNFMP; 09 May 2012 21:51:01 -0000 Received: from [127.0.0.1] by omp1007.access.mail.mud.yahoo.com with NNFMP; 09 May 2012 21:51:01 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 502900.95307...@omp1007.access.mail.mud.yahoo.com X-Yahoo-Forwarded: from recipi...@destination.com to recipi...@destination.com.br Return-Path: <all-boun...@lists.example.com> X-YahooFilteredBulk: 10.10.10.99 Received-SPF: pass (domain of lists.example.com designates 10.10.10.99 as permitted sender) X-YMailISG: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx X-Originating-IP: [10.10.10.99] Authentication-Results: mta1017.biz.mail.mud.yahoo.com from= lists.example.com; domainkeys=neutral (no sig); from=att.net; dkim=permerror (bad sig) Received: from 127.0.0.1 (EHLO localhost) (10.10.10.99) by mta1017.biz.mail.mud.yahoo.com with SMTP; Wed, 09 May 2012 14:51:01 -0700 Received: from myhost.hostingprovider.com (localhost [127.0.0.1]) by localhost (Postfix) with ESMTP id E9CA1123AB; Wed, 9 May 2012 21:43:23 +0000 (UTC) X-Original-To: l...@lists.example.com Delivered-To: l...@lists.example.com Received: from fmailhost01.isp.att.net (fmailhost01.isp.att.net [204.127.217.101]) by localhost (Postfix) with ESMTP id 1D84D123A4 for <l...@lists.example.com>; Wed, 9 May 2012 20:52:06 +0000 (UTC) DKIM-Signature: v=1; q=dns/txt; d=att.net; s=dkim01; i=memb...@domain.net; a=rsa-sha256; c=relaxed/relaxed; t=1336596725; h=Content-Type: MIME-Version:Message-ID:Date:Subject:In-Reply-To:References:To: From; yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy Received: from homecomputer3 (c-76-21-140-158.hsd1.va.comcast.net[76.21.140.158]) by worldnet.att.net (frfwmhc01) with SMTP id <20120509205204H0100sdv2pe>; Wed, 9 May 2012 20:52:05 +0000 X-Originating-IP: [76.21.140.158] From: "Member One" <memb...@domain.net> To: "'Example Discussion'" <l...@lists.example.com> References: < 13283191.1336591910177.javamail.r...@wamui-june.atl.sa.earthlink.net> In-Reply-To: < 13283191.1336591910177.javamail.r...@wamui-june.atl.sa.earthlink.net> Date: Wed, 9 May 2012 16:52:07 -0400 Message-ID: <!&!aaaaaaaaaaaaaaaaaaaaaaaaaaaaa==@att.net> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: xyxyzyzy Content-Language: en-us X-Mailman-Approved-At: Wed, 09 May 2012 21:43:22 +0000 Subject: [Example Discussion 110] Re: Example Subject X-BeenThere: l...@lists.example.com X-Mailman-Version: 2.1.14 Precedence: list Reply-To: Example Discussion <l...@lists.example.com> List-Id: Example Discussion <all.lists.example.com> List-Unsubscribe: <http://lists.example.com/m/options/all>, <mailto:all-requ...@lists.example.com?subject=unsubscribe> List-Archive: <http://lists.example.com/archive/all> List-Post: <mailto:l...@lists.example.com> List-Help: <mailto:all-requ...@lists.example.com?subject=help> List-Subscribe: <http://lists.example.com/m/listinfo/all>, <mailto:all-requ...@lists.example.com?subject=subscribe> Content-Type: multipart/mixed; boundary="===============4254722804560345795==" Errors-To: all-boun...@lists.example.com Sender: all-boun...@lists.example.com ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org http://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: http://mail.python.org/mailman/options/mailman-users/archive%40jab.org
