retraining spamassassin when using Mozilla mail box

[martin <ma...@excite.com>]

Dear all,
     We will use Mozilla mail/Junk box to training the spamassassin daily, but
found that when fetch some mis-ham-ed emails to retrain spamassasin (useing
---forget ), spamassassin will show "0 messages learned (from N messages)". Is
it meaned that the spamassassin can't find related email at its database (we
used global database and without user pref.)?

    Moreover, when using Mozilla Junk Box to train spamassassin (--spam -mbox),
is it needed to remove Mozilla added header like X-UIDL, X-Mozilla-Status,
X-Mozilla-Status2 etc?

   Thank for helping.