A few things to consider:
The mailing in February was the only one in the last 10 months.
I checked the logs on the test to Gork and the mailing list email WAS getting accepted by his server. Once it gets there, there is absolutely nothing we can do to find out why it doesn't get from the server to his mailbox.
I've got test accounts on hotmail, gmail and yahoo that always get the mailings. They sometimes go into the junk/spam boxes but I leave the settings to default to make sure I'm not preferentially filtering them into the main box so I can see what's going on for the typical user of those services.
Duplicates are filtered out before sending. If we do a full mailing, you'll be on the registration list, perhaps the download list and the forum. You'll only get one message, not three.
The To: addresses are:
mclist a t listserver.jriver.com
forum a t listserver.jriver.com
mlist a t listserver.jriver.com
mjlist a t listserver.jriver.com
The bulk sender lists are difficult to get on. I've tried several times without a lot of joy.
Also, as MrC says big servers usually have realtime blacklist connection rejecting software running.
We do the same here. I check to see that our address are not on the myriad of blocklists before we send a message.
Also, note that servers can have their own private blocklists which can't be seen.
So, as the bulk mailings go out I monitor the delivery logs to see if there are patterns of rejections. We often exceed the connection limits for a big provider but that means the email gets delivered later. 99% of the email including all of the ones to hotmail, yahoo and gmail are delivered within 2 days. Nearly all of the rest are inactive email addresses that get removed before the next emailing.
Here are the headers from the 24th of Feb email received at my gmail test account. I fail to see anything wrong in them:
Delivered-To: atester2001@gmail.com
Received: by 10.151.114.14 with SMTP id r14cs201126ybm;
Thu, 24 Feb 2011 15:36:57 -0800 (PST)
Received: by 10.150.218.16 with SMTP id q16mr2615254ybg.349.1298590616854;
Thu, 24 Feb 2011 15:36:56 -0800 (PST)
Return-Path: <mclist-return-19-atester2001=gmail.com@listserver.jriver.com>
Received: from listserver.jriver.com (listserver.jriver.com [204.75.156.22])
by mx.google.com with ESMTPS id d3si15753359ybi.26.2011.02.24.15.36.56
(version=TLSv1/SSLv3 cipher=OTHER);
Thu, 24 Feb 2011 15:36:56 -0800 (PST)
Received-SPF: pass (google.com: domain of mclist-return-19-atester2001=gmail.com@listserver.jriver.com designates 204.75.156.22 as permitted sender) client-ip=204.75.156.22;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of mclist-return-19-atester2001=gmail.com@listserver.jriver.com designates 204.75.156.22 as permitted sender) smtp.mail=mclist-return-19-atester2001=gmail.com@listserver.jriver.com
Received: (qmail 8336 invoked by alias); 24 Feb 2011 22:01:59 -0000
Mailing-List: contact mediajukebox@jriver.com; run by ezmlm
Precedence: bulk
X-No-Archive: yes
From: Media Center <mediacenter@jriver.com>
Delivered-To: mailing list mclist@listserver.jriver.com
Message-ID: <20110224220131.10529.qmail@linux.jriver.com>
Subject: Sweet 16 MC Beta Savings, and Before You Install IE9 RC ....
To: mclist@listserver.jriver.com
Date: Thu, 24 Feb 2011 16:01:31 -0600 (CST)
Sender: bob@jriver.com
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="US-ASCII"
I've got a test list that I can put anyone on that's having trouble then we can run a few test messages. Email me your preferred address... bob (at) jriver (dot) com
and in a couple of days I'll send out a test message.