does the X-Bogosity line mess up spamicity calculations?

[Trevor Smith]

On August 5, 2004 12:05 am, David Relson wrote:

> 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).

Oh, I see. Prevents an exploit "by eating the line", not prevents an exploit 
"by ignoring the tokens on that line when calculating the message's 
spamicity".

Which is an interesting subtlety since I thought bogofilter only ignored the 
tokens in that line. It actually goes one step better and discards them, 
right?

This explains behaviour I saw earlier when I ran bogofilter -p on a message 
already classified and saw the X-Bogosity line move around in the message 
header list.