If you are using an older version before Thunderbird 3 refer to our old guide.

Thunderbird 3 should automatically detect the proper mail settings simply by entering your name, e-mail address, and password.

astro.umn.edu email addresses are aliases for physics.umn.edu email accounts. For automatic setup to work if your email address ends in astro.umn.edu you should change it to end in physics.umn.edu.

After it detects the settings, simply click Create Account and you are done.