[Mailman-Users] non-web unsubscribe

[Duncan McQueen]

Is there a way to remove a user from a list without logging onto the 
web-interface?  On our site, the web-server is limited to intranet 
users only, but the list is sent out to people all over the world.  I 
want to automate their removal, but I have tried sending an email 
saying 'unsubscribe [email-address]' and nothing happened.

Thanks,
Duncan McQueen