Step Wise Manual One2free mail settings for thunderbird
If you don't have a One2free mail address. you can create an email id from here then you can One2free 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, One2free Email address and Password then press Continue.
Click on the Manual config menu at bottom.
Enter Below One2free incoming server settings.
In incoming click on the dropdown menu and select IMAP.
Add server host :imap.one2free.com
Port: 143
select SSL/TLS
Enter Below One2free outgoing server settings.
In outgoing select SMTP.
Add server host :smtp.one2free.com
Port: 465
select SSL/TLS
Tap on Done. Now you are ready to use your One2free email account on your Thunderbird.