does the X-Bogosity line mess up spamicity calculations?

[David Relson]

On Wed, 4 Aug 2004 23:48:55 -0300
Trevor Smith wrote:

> On August 4, 2004 9:46 pm, David Relson wrote:
> 
> > Good question!
> >
> > Bogofilter checks for the "spam header line" (as it's officially
> > known) and ignores it.
> 
> OK, so any tokens appearing on a line that starts with "X-Bogosity"
> (or whatever token you have bogofilter set to insert on the "spam
> header line") are ignored and never entered in the database?
> 
> > This prevents a spammer from deceiving bogofilter.  As 
> 
> I don't see how it could be used to fool bogofilter. Can you explain
> the strategy?

Suppose I know that you're using bogofilter.  Suppose I include
"X-Bogosity: No" in my headers.  If bogofilter passed that line through
(rather than eating it), your email program will think bogofilter
classified the message as ham and will accept it as ham (rather than
reject it as spam).