does the X-Bogosity line mess up spamicity calculations?

[Trevor Smith]

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?