On 7/8/16 4:32 PM, Hirayama, Pat wrote:
> 
> User was reusing an old message that was previously sent to the list, and 
> then using Outlook's 'Send Again' feature, which caused the message to 
> contain headers that mailman placed into the original message.  When the 
> IncomingRunner process saw the message come through 'again', it discarded the 
> message.


The offending header was X-BeenThere: with the list name. This causes
the Approve handler to raise LoopError which is a subclass of
DiscardMessage to discard the message.

In compiling the original list of reasons for this discard, I  looked
for subclasses of DiscardMessage, but I missed this one.

-- 
Mark Sapiro <m...@msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan
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