[Mailman-Users] Mailman reusing message-id, leads to duplicate message suppression

[Joseph Brennan]

--On November 5, 2013 10:25:20 AM +0100 Ralf Hildebrandt 
<Ralf.Hildebrandt at 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