Masaharu Kawada writes:

 > The failed mail shows an 'x-beenthere' header in it like below.

 > The 'x-beenthere' header looks to be the reason why the problematic
 > mailing list fails to receive mail from user, but I have no idea in
 > what kind of situation we get 'x-beenthere' header in mail.

That means either that (1) the message has previously been
successfully posted to the list (not necessarily by that user), and
the user is resending the message "as is" to the list (some MUAs call
this "forward" or "bounce"), or (2) something very odd is happening.

(1) might happen if the post is, say, a FAQ or introduction to the
list and the user wants to post it on a regular basis.  "Resending" to
the list might seem like an easy way to do it, but will fail because
of the x-beenthere header.

I have no idea why case (2) would happen, except as a bad joke by
somebody who understands mail and Mailman quite well.

 > Does anyone in the list have any idea to describe why the mailing
 > list is unavailable to receive mail?

As you suspected, the x-beenthere field will prevent that list from
receiving that post.  It needs to be removed from the message before
resending.

If the situation I described above is what it happening, the best
solution is simple: make a template message, and copy that into a new
message each time.

If the sender really likes the forward method, I don't recommend it,
but they can CC themselves, then delete the mailing list post from the
folder where they keep such form messages when it arrives.  The user's
personal CC copy won't go through the list, and it won't have the
x-beenthere field, so can be resent "as is" as many times as you like.

Steve
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