[Ipg-smz] Fwd: Mail Delivery Failure

[Dennisf63]

For some time now I've been getting Mail Delivery Failure messages seen 
below.

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?

Is the problem me or the recipients? Is it the email system? Is the 
intended recipients box full?

Oh, I'm using Mozilla Thunderbird, if that helps.

Thanks in advance.

-------- Forwarded Message --------
Subject: 	Mail Delivery Failure
Date: 	Sat, 03 Nov 2018 06:44:17 -0400
From: 	Mail Delivery System <no-reply at directv.net>
To: 	fowler63 at alumni.princeton.edu



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:

>>> viv8 at aol.com (while not connected): 554 5.4.7 [internal] exceeded max retries without delivery

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X-CNFS-Analysis: v=2.2 cv=A+ouBOeG c=1 sm=1 tr=0 a=LCiirvNvtBJImjm3Nid19g==:117 a=LCiirvNvtBJImjm3Nid19g==:17 a=KGjhK52YXX0A:10 a=JfZcPfUAORQA:10 a=smKx5t2vBNcA:10 a=ycuZgsgiZhcA:10 a=r77TgQKjGQsHNAKrUKIA:9 a=2QwclzV6UOKMP8WnS80A:9 a=QEXdDO2ut3YA:10 a=CjxXgO3LAAAA:8 a=V6w5agwDQz6HPDWQtKgA:9 a=_W_S_7VecoQA:10 a=1m4Zgbpv53Vw1cuBpUcA:9
X-CM-Score: 0
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X-Authed-Username: ZGVubmlzZjZAd2lsZGJsdWUubmV0
Authentication-Results:  smtp01.viasat.aga.synacor.com smtp.user=dennisf6; auth=pass (LOGIN)
Received: from [75.104.131.48] ([75.104.131.48:59690] helo=[192.168.1.142])
	by smtp.wildblue.net (envelope-from <fowler63 at alumni.princeton.edu>)
	(ecelerity 3.6.6.45965 r(Core:3.6.6.0)) with ESMTPSA (cipher=DHE-RSA-AES128-SHA) 
	id 00/E1-30592-351B9DB5; Wed, 31 Oct 2018 09:42:49 -0400
Subject: Re: MHS Bio-Books are ready for printing
To: Vivien Cord <viv8 at aol.com>
References: <1663592058.699057.1540990870399.ref at mail.yahoo.com>
 <1663592058.699057.1540990870399 at mail.yahoo.com>
From: Dennisf63 <fowler63 at alumni.princeton.edu>
Message-ID: <d93f63f4-f868-0677-5381-5cb14a1d0b3c at alumni.princeton.edu>
Date: Wed, 31 Oct 2018 09:42:11 -0400
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In-Reply-To: <1663592058.699057.1540990870399 at mail.yahoo.com>
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