in dovecot/conf.d/90-plugin.conf i have
plugin {
 ? # man antispam
 ? #setting_name = value
 ? antispam_debug_target = syslog
 ? antispam_verbose_debug = 1
 ? antispam_backend = pipe
 ? antispam_signature = X-DSPAM-Signature
 ? # action to take on mails without signature
 ? # (used with any backend requiring a signature)
 ? # (we recommend only setting this to 'move' after verifying that the
 ? # whole setup is working)
 ? # antispam_signature_missing = move # move silently without training
 ? antispam_signature_missing = error
 ? antispam_trash = Trash
 ? antispam_spam = Junk
 ? antispam_pipe_program_spam_arg = --spam
 ? antispam_pipe_program_notspam_arg = --ham
 ? antispam_pipe_program = /usr/bin/sa-learn
 ? antispam_pipe_program_args = --username=%Lu
}
it seems to be going into the database ok but it doesn't seem to be 
applying anything it is learning.? might there be some configuration 
option missing?