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