Outgoing server for my email address is set to iCloud
I removed my email account and set it up again, now the outgoing server is set to iCloud and I cannot send emails anymore. I tried to add another SMTP outgoing server with my email providers data, it connects (connection doctor says) but won't send emails, because "The server response was: Authentication required".
Any ideas how to fix this? It is the same email address I use as my apple ID.
MacBook Air 13″, macOS 11.1