How do I configure mail for Thunderbird?

The latest release of Thunderbird (3.1.4) changes the way E-mail accounts are setup and detected. With this version the program Setup Wizard will automatically try and detect what accounts and settings to use (assuming you are installing on top of an existing, older version of Thunderbird). If you have recently upgraded Thunderbird, please check the following information as we have found that the Setup Wizard does not always guess the correct settings to use.

Manually Configuring your Email Account

1. From the Thunderbird menu, go to Tools > Account Settings.
2. Select "Server Settings" from the Account Settings menu options.
3. The first thing to check is to see if the "Server Type" value is set to "POP Mail Server".
4. If it does not read POP, you must manually delete this account and recreate a new one. We know this workaround is not ideal, and can be time consuming and not very user-friendly. We have included a screenshot to help illustrate:
   

Screenshot of Thunderbird Settings
Settings you will need to input on this new Mail Account Setup screen are as follows:
Incoming and Outgoing = mail.yourdomain.com (this is mailman.c4.net for all @c4.net accounts)
Incoming should be set as "POP" , Port as 110 , and select "None"
Outgoing should be set as "SMTP" , Port as 587 , and select "None"
When finished with these settings, press the "Manual Setup" button
5. Check the Server Name value. This should read mail.yourdomain.com (this is mailman.c4.net for all @c4.net accounts)
6. Check the Port value, this should be set to 110.
7. Select "Outgoing Server" from the Account Settings menu, and verify the following information:
   - The Server Name should read mail.yourdomain.com (this is mailman.c4.net for all @c4.net accounts)
   - Port should be 587
   - "User Name" should be your mailbox username
   - "Authentication Method" should be "Password, transmitted insecurely"
8. Press the "Edit" button and make any necessary changes if the above information is not correct. Press "OK" when finished, and "OK" again to accept and apply your changes.