personal.tcl mailbot

What: personal.tcl mailbot
Where: http://www.purl.org/NET/akupries/soft/mail/
Description: aka mbot - highly specialized filter for personal messages - MUST not be used if mailbox receives mailing list traffic. Now distributed as one of the tcllib demos.
Updated: 11/1999
Contact: mailto:[email protected] (Marshall T. Rose)

Can anyone explain why mbot must not be used if the mailbox receives mailing list traffic?