http://bugzilla.spamassassin.org/show_bug.cgi?id=3055
------- Additional Comments From [EMAIL PROTECTED] 2004-02-17 18:03 -------
Subject: Re: New: Bayes: use hash instead of Message-Id?
On Tue, Feb 17, 2004 at 04:18:30PM -0800, [EMAIL PROTECTED] wrote:
> What were the objections to using a hash of some selected headers (From, To,
> Subject) and the message body, again? Strikes me this is a more resilient
> way to avoid spammers using 1 message ID for all their spam and evading
> bayes learning that way.
I think the issue was that as the mail gets passed through MTAs and such,
enough of the message could change such that the hash won't match anymore.
Doing a hash instead is trivial (if you don't mind ignoring the non-hash
entries)... M::SA::Bayes::get_msgid() already does a hash if there is
no/no valid Message-Id header:
# Use sha1(Date:, last received: and top N bytes of body)
# where N is MIN(1024 bytes, 1/2 of body length)
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