Mail app cannot load mails

Hello e Community,

I recently upgraded my FP3 from to the latest stable eOS release (based on Android 10). Since then I got problems with receiving mails from my eCloud account.

It says “Unkown host” or “SSLExcetption” (see screenshots). I firstly thought that this was caused by the 2FA, but even after I disabled it and re-added my eCloud account. It still produces this error.

Does anybody encounter this issue?