[Mailman-Users] List posts sent to AOL list subscribers bounce as undeliverable (v. 2.1.20)

[Woody Mon]

Thank you  for everyone's ideas and recommends. 

I've checked and every list subscriber has the 

As Mark suggested trying, I'll change "from_is_list" to "Munge From" to see if that has any effect. And if not will try "Wrap Message".

Note that almost all list subscribers are set to receive Digests, so hoping this doesn't mess with the format of the digests any (the list is text only, no html or attachments)..

As Mark related, I suspect the issue is DNS related, and AOL is just finally cracking down on mail sent from this particular list server.

A free web based DNS checker reports the following for the listserver domain:

1. FAIL - SOA record check. "No nameservers provided an SOA record for the zone". 

2. FAIL - MX records check. "No MX records exist within the zone. This is legal, but if you want to receive E-mail on this domain, you should have MX record(s)." 

3. PTR record for the domain "Error: Invalid IP address"

I'm not privy to the details but I suspect the list server runs within a virtual host environment. 

>From the header of a list digest email I received yesterday

-----
Return-Path: Listname-bounces at lsubdomain.domain1.org
X-RC-FROM: <Listname at lsubdomain.domain1.org>
Received: from localhost ([127.0.0.1]:obfuscated-port# helo=hostname.domain2.org)
	by hostname.domain2.org with esmtp (Exim 4.85)
	(envelope-from <Listname at lsubdomain.domain1.org>)
	id obfuscated date & timestamp

X-AntiAbuse: Primary Hostname - hostname.domain2.org
X-AntiAbuse: Original Domain - domain3.org
X-AntiAbuse: Sender Address Domain - subdomain.domain1.org

From: Listname-request at subdomain.domain1.org
Subject: Listname Digest, Vol ##, Issue ###
To: Listname at subdomain.domain1.org
Reply-To: Listname at subdomain.domain1.org
-------

It appears the listserver domain (domain1) runs on the domain2.org host and which is responsible for sending mail for domain1. Whereas the 'abuse' domain (domain3) is the domain name of the parent organization which hosts domain2, which the domain1 listserver runs upon.

I'm considering sending a direct email to all the list subscribers with AOL addresses, recommending they either contact AOL to request a whitelist solution or to send us an alternative (freemail) email address which we'll change their list subscription to.

Besides the list provider repairing their DNS configuration, is the above a recommended solution? 

If I was a network administrator I likely could phrase all this in better terms. ;-)