[Mailman-Users] confirm for one list errors, other list works

[Anne Ramey]

I added a new list to my mailman yesterday (cplist), and copied the 
config over from another list (mbalist).  Subscribe comfirmations to 
cplist fail if you reply to the mail with "Invalid confirmation 
string:", but the link inside the mail works fine.  The reply to the 
subscribe confirmation for the other list (mbalist) works fine.  I'm 
using mailman 2.1 on linux.  Any idea what might be causing this?

Anne