Step Wise Manual Y7mail mail settings for thunderbird
If you don't have a Y7mail mail address. you can create an email id from here then you can Y7mail 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, Y7mail Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below Y7mail incoming server settings.
In incoming click on the dropdown menu and select IMAP.
Add server host :imap.mail.yahoo.com
Port: 993
select SSL/TLS
Enter Below Y7mail outgoing server settings.
In outgoing select SMTP.
Add server host :smtp.mail.yahoo.com
Port: 465
select SSL/TLS
Tap on Done. Now you are ready to use your Y7mail email account on your Thunderbird.