Folks, As you know we've been moving all Red Hat lists that were on our old server running qmail and smartlist over to a new box running postfix and Mailman. I won't go into the details of migration, but I wanted to give you some information about the new list.
All subscribers have a passwords associated with their subscription.
You must use this password in order to alter the settings for how you receive email. However, this is no longer necessary. Archives of the list are also available online. Sorry, they are not searchable. Also, you've noticed that the headers are different.