I'm a new user of Mailman, and have a long list of email addresses from which inquiries have come to me, many of which are no longer valid.  Is there a way to:
 
1.  Disable passwords, so that by simply replying to an email from the list with the word "unsubscribe" in the subject line, a user can be removed?
 
2.  Have fatal "undeliverable" notices automatically remove that user from the list?
 
Thanks in advance for your help.
 
Jordan Graham

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