too many children processes

[Brad White]

I have max children set to 5, and there are 10 child MailScanner processes running.  This seems to be messing up the processing of mail.  When I run the /etc/init.d/Mailscanner stop script it only stops half of the processes.  This is running 4.20-3, and has been for many days without any problems.  No changes have been made to the system.  Where are the other 5 MailScanner children coming from?
 
Thanks.