I found the reason for this. The MUA I'm using (evolution) added a bug
where pretty much all readers were copied into a reply from the original
message, including the list control headers (specifically X-Beenthere:).
This caused Mailman to drop the message silently.
I'd suggest that the error path causing a message to dropped in these
circumstances is modified to at least log a message somewhere - anything
that throws mail away *must* be logged otherwise confused mail admins
tear their hair out :-)
Nigel.
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