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