[Mailman-Users] How do I backup the emls in database?

[Strategic Web Design]

I'm in a pickle here.  

I have a couple of websites that have over 2000 emails in the mailing list.  I am moving the sites to another server.   How do I extract the emails [preferably a .txt file] so I can put them in the new mailing list on the new server [which is also "mailman"]

I go to members list, and the only options are clicking on the "letters" to view the email addresses. 

Thanks for all your help!   :o)

~Melissa