Set up an e-mail account on Mozilla Thunderbird guide
E-MAIL ACCOUNT GUIDE FOR MOZILLA THUNDERBIRD
To configure your email account in Mozilla Thunderbird, follow these steps:

From the menu in the right , choose 'Options' and then 'Account Settings'

Choose 'Add Mail Account'

Enter your name, email address and password and press Next

In this tab, you must make the settings as shown in the picture, replacing (domain.gr) with your own domain name and
(Info@domain.gr) with your email address.
Finally press the 'Done' button and then 'OK' in all the remaining tabs.