Bogotune and files in a folder

[Tamer Yousef]

Hi,
I'm trying to run bogotune to check for the best settings:

bogotune -v -T 0  -d ~/.bogofilter -n /etc/bogofilter-1.2.4/bogotune/good/
-s /etc/bogofilt
-1.2.4/bogotune/spam/

and it returns:
---------------------------
Reading /root/.bogofilter/wordlist.db
Reading
/etc/bogofilter-1.2.4/bogotune/good/mboxdata_0000d6b5-710d-4c33-be66-b0d6b333553a.mbox
1 messages
Reading
/etc/bogofilter-1.2.4/bogotune/spam/mboxdata_00003ff1-d848-40ea-a02f-8d3e9719b249.mbox
1 messages
wordlist's ham to spam ratio is 1.2 to 1.0
The messages sets contain 1 non-spam and 1 spam.  Bogotune requires at
least 500 non-spam and 500 spam messages to run.

how do I change it to consider all .mbox file in the input directories? I
do not want to run it individually for each file since that I only have one
message per file so there are thousands of files in the non-spam and spam
directories.

Do I need to merge all nonspam messages in one file, and same for spam
messages and run it this way?

thanks!
Tamer