Open Mozilla Thunderbird
From the Tools menu choose Account Settings
On Account Actions choose Add Mail Account
In the Mail Account Setup screen enter your name, email address and your password into the relevant boxes then click Continue.
Thunderbird will now test for standard settings
Click on Manual Config
Next to “Incoming” choose POP3 or IMAP and enter your email server address in the Incoming server hostname box.
Your email server address is “mail.” followed by your domain-name. E.g. if your domain name is example.com you would enter mail.example.com
Next to “Outgoing” enter the same email server address again. Choose “587” in the port drop-down box.
Next to “Username” enter your full email address.
Click the “Done” button.