Step Wise Manual Ybb mail settings for thunderbird
If you don't have a Ybb mail address. you can create an email id from here then you can Ybb 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, Ybb Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below Ybb incoming server settings.
In incoming click on the dropdown menu and select IMAP.
Add server host :imap.mail.yahoo.co.jp
Port: 993
select SSL/TLS
Enter Below Ybb outgoing server settings.
In outgoing select SMTP.
Add server host :apple.smtp.mail.yahoo.co.jp
Port: 587
select SSL/TLS
Tap on Done. Now you are ready to use your Ybb email account on your Thunderbird.