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