Step Wise Manual Earthlink mail settings for thunderbird
If you don't have a Earthlink mail address. you can create an email id from here then you can Earthlink email login.
Open Thunderbird Software App. Click on Email
When you click on the email, pop-up Set UP an Existing Account Screen.
Enter Your name, Earthlink Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below Earthlink incoming server settings.
In incoming click on the dropdown menu and select IMAP.
Add server host :imap.earthlink.net
Port: 143
select SSL/TLS
Enter Below Earthlink outgoing server settings.
In outgoing select SMTP.
Add server host :smtpauth.earthlink.net
Port: 587
select SSL/TLS
Tap on Done. Now you are ready to use your Earthlink email account on your Thunderbird.