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