Alexander Adolf <alexander.adolf@condition-alpha.com> writes:

>
> Bearing in mind that re-recognising a message which has arrived
> multiple times via different routes is a worthwhile feature, it would
> seem to me that a hash over the invariant part of the message, that is
> the body, would allow for such detection. In that light, it would seem
> to me that the tuple (body_hash, message_id) could be a candidate for
> a “unique enough”(tm) identifier?

I always had the impression that the message body had too variation
imposed by different delivery routes for this to be very helpful:
essentially the hash would be different for every file due to trailers
added by mailing lists, re-encoding, stupid "external message" headers
added by malicious^Wcorporate mail servers, etc...

I could be wrong, maybe hashing is a useful approach, but I'd need to
see some numbers to be convinced.
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