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<p>Looking at the message headers, it shows you're going through
Reporting-MTA: dns; smtp01.viasat.aga.synacor.com which is a
high-latency link. Takes a lot of time to go up in the air to a
satellite, than back down.</p>
<p>AOL/OATH is probably answering, then shutting down the message
conversation, having believed it heard nothing.</p>
<p>My suggestion is to use an online mailbox, example: protonmail,
outlook, google, or another box, and use pop3 to sync to your
Thunderbird account, but send through the web interface of one of
those engines. If you can logon to princeton.edu to send messages
as a web page, this would be the most ideal situation and cuts the
latency out of the equation.<br>
</p>
<p>tl;dr send messages through an online interface, rather than
originating them with Thunderbird; use Thunderbird to read/store
but NOT originate messages. <br>
</p>
<p>This is a problem with sat links, fixed by going online to a web
interface to send messages. There is no real "fix" for this where
you're originating through a sat-based email client like
Thunderbird; Outlook mail on your machine would be just as ugly;
it's the nature of the high latency of the link between you, your
mail server/MTA, and the target recipient's site.</p>
<p>The MTA you're currently using is a problem; use the web
interface of a mail app, as it won't time out and will be sending
your message as an agent using terrestrial links, which have less
latency. <br>
</p>
<p>Your setup is an "edge" case. Sorry.</p>
<p>Tom</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 11/3/18 8:05 AM, Dennisf63 wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1c4ac3c7-fede-3831-d8b5-24351c162a10@alumni.princeton.edu">
<p>For some time now I've been getting Mail Delivery Failure
messages seen below. <br>
</p>
<p>This is just a single sample. It doesn't happen all the time,
just often enough to be irritating. Often the outgoing messages
are replies from me to them. Only certain recipients seem to be
involved, but more than one. Can anyone interpret what these
Mail Delivery Failure Messages are trying to tell me? <br>
</p>
<p>Is the problem me or the recipients? Is it the email system? Is
the intended recipients box full?</p>
<p>Oh, I'm using Mozilla Thunderbird, if that helps. <br>
</p>
<div class="moz-forward-container">Thanks in advance. <br>
<br>
-------- Forwarded Message --------
<table class="moz-email-headers-table">
<tbody>
<tr>
<th nowrap="nowrap">Subject: </th>
<td>Mail Delivery Failure</td>
</tr>
<tr>
<th nowrap="nowrap">Date: </th>
<td>Sat, 03 Nov 2018 06:44:17 -0400</td>
</tr>
<tr>
<th nowrap="nowrap">From: </th>
<td>Mail Delivery System <a class="moz-txt-link-rfc2396E"
href="mailto:no-reply@directv.net"
moz-do-not-send="true"><no-reply@directv.net></a></td>
</tr>
<tr>
<th nowrap="nowrap">To: </th>
<td><a class="moz-txt-link-abbreviated"
href="mailto:fowler63@alumni.princeton.edu"
moz-do-not-send="true">fowler63@alumni.princeton.edu</a></td>
</tr>
</tbody>
</table>
<br>
<br>
<pre>This message was created automatically by the mail system (ecelerity).
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
>>> <a class="moz-txt-link-abbreviated" href="mailto:viv8@aol.com" moz-do-not-send="true">viv8@aol.com</a> (while not connected): 554 5.4.7 [internal] exceeded max retries without delivery
</pre>
</div>
<br>
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</blockquote>
<pre class="moz-signature" cols="72">--
Tom Henderson
ExtremeLabs, Inc.
+1 317 250 4646
Twitter: @extremelabs
Skype: extremelabsinc</pre>
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