Step Wise Manual Concentric mail settings for thunderbird
If you don't have a Concentric mail address. you can create an email id from here then you can Concentric 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, Concentric Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below Concentric incoming server settings.
In incoming click on the dropdown menu and select POP.
Add server host :pop3.concentric.net
Port: 110
select SSL/TLS
Enter Below Concentric outgoing server settings.
In outgoing select SMTP.
Add server host :smtp.concentric.net
Port: 25
select SSL/TLS
Tap on Done. Now you are ready to use your Concentric email account on your Thunderbird.