I created a new list named "Sys".  When I subscribe and confirm by web, I get the following web page.  Note the "%(listname)s" on the second line.
Awaiting moderator approval
You have successfully confirmed your subscription request to the mailing list %(listname)s, however final approval is required from the list moderator before you will be subscribed. Your request has been forwarded to the list moderator, and you will be notified of the moderator's decision.
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Sys list run by spertus at mills.edu
Sys administrative interface (requires authorization)
Overview of all javamlm.mills.edu mailing lists

Later substitutions (such as at the foot of the page) are successful.  When I look at the list directly in Python, it seems to be okay:
>>> sys
<mailing list "sys" (unlocked) at 82fb764>
>>> sys.real_name
'Sys'
>>> sys._internal_name
'sys'

I'm using Mailman 2.1a3.  Any ideas what could be wrong?

Ellen