Thanks and apologies, Mark.  I sent the latest post before I went back and read 
through the earlier exchange on this topic.  Had forgotten what you said 16 
months ago.  The problem seems to be triggered when I post to the list with the 
stevebrown address, likely due to a mismatch between the way Mailgun constructs 
headers and the way Mailman3 processes them.  The good news is that I now know 
what "grepping" is.  Am I correct that I cannot do that as a mere list manager 
and not a Mailman3 platform operator with Linux?
Also good to know about VERPing.  I'm not enough of an IT guy to know the lingo 
well.
Steve
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