Before setup your Thunderbird, please make sure you have the below information
incoming mail server : mail.yourdomain.com
outgoing smtp server : smtp.yourdomain.com
email address : user@yourdomain.com password : *****************
Create a new account
Skip this and use my existing email
Your name: user
Email address: user@yourdomain.com
Password: xxxxxxxx > Continue
Select Pop3
Manual config
Advanced config
Server Settings
Server Name: mail.yourdomain.com Port: 110
User Name: user@yourdomain.com
Connection security: None
Authentication method: Encrypted password
Outgoing Server(SMTP)
Edit
Server Name: smtp.yourdomain.com
Port : 465
Connection security: None
Authentication method: Encrypted password
User Name: user@yourdomain.com > OK
OK
Click “Get Mail”
Enter email password > OK
Setup completed