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Re: fighting spam || avoiding spam

On Tue, Jun 08, 2004 at 03:43:22PM +0200, Santiago Vila wrote:
> On Tue, 8 Jun 2004, Duncan Findlay wrote:
> > SpamAssassin may check more headers than are necessary, i.e. it will
> > check forged headers added by spammers, but that can only improve it's
> > hit rate and reliability, not decrease it.
> That was exactly my point. SpamAssassin may check more headers than
> are necessary. If your machine is in the XBL but you relay your
> messages via your ISP's SMTP server (which is supposed not to be),
> then your IP will be in one of the Received: headers. However, that
> should not count as a "false positive" because no Debian machine would
> reject such email with the suggested GR (only your ISP's SMTP server
> IP would be considered).

That case is supposed to be handled by SpamAssassin.
> By a "more sophisticated script" I meant a script which does not just
> merely pass messages to spamassassin as a "black box", but instead
> one that takes in account the exact and single Received: header which
> should be considered in each case.

If you come up with an algorithm to determine exactly which headers
should be checked against every different type or DNSBL in all
situations, I'd like to see it...

Duncan Findlay

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