The following instructions will walk you through setting up an Email account through the Mozilla Thunderbird Email client. Please note that while the screenshots were taken from v12.0.1 they should apply to most versions of this client, both newer and older.
1) Click on "tools", then "account settings".
2) Click on "account actions", then "add mail account".
3) Under "mail account setup" it will ask for your name, your email address, and password. The email address and password are going to be exactly what you have already configured in your cPanel account. Click "continue".
4) Thunderbird will attempt to auto detect your account settings, when it fails it will allow you to enter your own settings. you will want to use the following for your settings.
IMAP vs POP3: Total Server Solutions supports both IMAP and POP email accounts. We recommend using IMAP as your mail remains on the server and is not downloaded to your computer. This ensures that your mail will be accessible from multiple computers. However, you are free to use either mail type.
SSL: You will want to use SSL/TLS encyption for both incoming and outgoing. Both STARTTLS and SSL/TLS options should work.
Authentication: Select "Normal Password" for both incoming and outgoing.
Username: This must be the full email address of the account you have created in cPanel.
For both the incoming and outgoing mailserver you will use the hostname of the server where your mail account is set up. You can find this information in your client area under Services -> My Services -> View Details, then "Hostname / Mail Server" for Standard and E-Commerce Web Hosting accounts.
Once you have adjusted the settings correctly, the "Re-Test" button should be able to test and confirm that your settings are correct. Once verified click "create account"
Reviewed : 11/13/2016