Step Wise Manual Ymail mail settings for thunderbird
If you don't have a Ymail mail address. you can create an email id from here then you can Ymail 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, Ymail Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below Ymail incoming server settings.
In incoming click on the dropdown menu and select SMTP.
Add server host :smtp.mail.yahoo.com
Port: 465
select SSL/TLS
Enter Below Ymail outgoing server settings.
In outgoing select IMAP.
Add server host :imap.mail.yahoo.com
Port: 993
select SSL/TLS
Tap on Done. Now you are ready to use your Ymail email account on your Thunderbird.