FYI, I'm just using a Yahoo email account (via web interface) to post to the 
Mailman-users list. I don't use this account for much anything else.

All posts to the list in question are moderated and almost all are sent from a 
Mozilla Thunderbird email client.

And almost all subscribers (including AOL subscribers) are set for digest mode.

In the list mail the from line always shows the [email protected] 
(not an individual email address or freemail domain)

How do I find these DMARC workarounds which you speak?

--------------------------------------------
On Fri, 12/4/15, John wrote:

 I see that you have a yahoo.com address.  If there's a yahoo.com address on 
the From: line of the list mail, AOL and Yahoo's well documented abuse of DMARC 
will cause the failure you're seeing.
 
 If you're running a recent version of Mailman, there are some DMARC 
workarounds you can use.  Other than that, I'd find a different address to mail 
from, not at Yahoo, not at AOL, and preferably not at Gmail.
 
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