Every time this debate comes up, I drag out this old posting which I
still like myself. Don Gilbert is right that the Message-Id is
probably the most definitive and potentially useful feature in a
message, but I doubt if it will win widespread following in the user
community due to its apparent complexity. His example of its use with
Gopher was convincing though (so I should modify my earlier opinion
below 8-). In regards to another question, message ids are supposed
to be unique, and I do not believe that they are affected by going
from mail to news or vice versa (though I am not going to swear by
this given the multitude of programs in existence 8-).
Dave
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