>> ------------------------ Yahoo! Groups Sponsor
>> --------------------~-->
>> Yahoo! Autos. Everything you need to know about
>
>
> GREAT, so by putting my message below the sponsor
> line, you will never see this??
I only wish you were that easy to get rid of. :-)
The filter is smart enough to chop off only when the sponsor banner starts
in column 1 (that's what the ^ means), so quoted sponsor banners don't get
lopped off.
I'm sure there are various diabolical ways to foul it up, like top-quoting
with no ">" prefix, but I've been using this filter for years and I'm not
aware of it ever having eaten something it shouldn't.