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From: John Griffith <griffith@sfs.nphil.uni-tuebingen.de>
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Subject: Re: Moving & suppressing
Date: 02 Aug 1996 14:20:13 +0200
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>>>>> "GS" == Greg Stark <gsstark@MIT.EDU> writes:

    GS> While trying to evangalize a bit someone asked if Gnus could
    GS> prevent them from seeing the same e-mail message twice even if
    GS> the message-id's weren't available.

    GS> This would be possible if we hashed the entire article, or
    GS> even just the length and the first block of the article and
    GS> saved that as a kind of pseudo-message-id. This really would
    GS> be pretty nice, even i often see the same mail message on
    GS> multiple lists that i read via mail archives, and often these
    GS> archives don't retain the message-id's (i disagree with that
    GS> as well of course, but Gnus should be general enough to not
    GS> assume all the backends are news or mail. Some backends won't
    GS> have any concept of message-id.)

I think this would be nice as well, but difficult.  One problem with
this is that some lists add other junk to the beginnings and ends of
such messages, like "Forwarded through the blah list", or at least
extra white space.  Leading white space could be ignored when hashing,
but the other junk would be more problematic.  Other times messages
are embbeded in some kind of digest, so the parts of the digest would
have to be compared.