If you are a list member, try the Mailman 2.1 Members Manual. If that doesn't help answer your question, you should contact your list administrator. Instructions are here: Mailman 2.1 Members Manual#4 I need to talk to a human!.
List administrators, similarly, may wish to look at the Mailman 2.1 List Administrators Manual or to talk directly with their hosting providers.
If you don't have full control over your installation of Mailman, 90% of the time you will need to get help from your hosting provider. Please contact them first!
If those don't help:
See Also: I have a basic question -- What kind of information do I need to provide when posting a question to this mailing list? and I have a specific-detailed question -- What kind of information do I need to provide when posting a question to this mailing list?
This is one of many Frequently Asked Questions