--On November 5, 2013 10:25:20 AM +0100 Ralf Hildebrandt <ralf.hildebra...@charite.de> wrote:


Who's to blame? Mailman for re-using the message-id? Exchange for
dropping the second mail on the floor?


The messages are duplicates, so they should have the same Message-ID.

Whether to suppress delivery of duplicates is the choice of an end user, or a system administrator, or a software designer. I don't know which applies to Exchange. But in order to allow the choice, which is correctly a choice to be made at the receiving end, the dups have to be sent with the same Message-ID.

I wouldn't say 'blame'.

Joseph Brennan
Columbia University I T



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