In article <201304200212.r3K2C2rS010542 at rickmurphy.net>,
Rick Murphy <rick at rickmurphy.net> writes:
Filter on List-Id. That's what it's for.
Adding crap to the Subject
header is for people stuck running [Microsoft Exchange] and other offensive
incompatible mailers.
...and of course, it also has nothing to do with Exchange. Exchange
doesn't strip the List-Id header and anyone can filter on List-Id when
they get their email through Exchange.
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