Go to the Tools menu and click on Account Settings…
At the bottom left of the window, you should see a dropdown that says Account
Actions. Click the dropdown and select Add Mail Account.
Enter your name, CS email address, and password and click Continue.
Thunderbird should automatically configure your account to use the correct settings.
If it does not, or you would like to confirm your settings, click on the
button that says Manual Config and check that the settings are as follows: Incoming: IMAP imap.cs.umd.edu 143 STARTTLS Normal password Outgoing: SMTP smtp.cs.umd.edu 587 STARTTLS Normal password
Click Done.
Your email account should now appear in the left sidebar of Thunderbird and
begin pulling messages from the server.