messages bouncing with Message too long (>40000 chars)

Adam Williams <[email protected]> Thu, 07 Feb 2008 12:12:52 -0600

Newsgroups	gmane.mail.majordomo.general
Message-ID	<[email protected]>

on a mail list I have, messages w/ attachments bounce with the error 
Message too long (>40000 chars).  However, in 
/usr/local/majordomo/lists/listname.config I have

maxlength = 0

so it should let a message of any size go through, right?  So why is it 
bouncing messages >40000 characters?