Bogofilter with Claws Mail, seems not to act on spam

[Adrian]

John G Walker via bogofilter <bogofilter at bogofilter.org> wrote:
> Which upgrade do you mean?
I may not have said.  I've had lots of reconfig work after a systems
outrage (not outage) when I lost my root partition (but have data and
config).
> 
> And I've tried with an individual message on the commend line, with no
> success, making me think the problem might be with bogofilter and not
> Claws Mail,
It must be bogofilter.  It is with me.  I can't pass it a single file.

UPDATE.  As I typed I thought to try one thing.  I replaced the -n with
-t - to test the mail, not record it as ham.
bogofilter -t -vvv -B mail.txt
and that worked·

The different verbosities, -v, -vv and -vvv do different things, but
the -vvv which I was expecting to list weightings for EVERY word is
just giving this.
  N_P_Q_S_s_x_md                        0  0.000000  0.000000  0.520000
                                                            0.017800  0.520000  0.375000
-which gives this very non-spam mail a pretty spammy score.  Maybe I
need to train with a lot more ham mails.