Send Apple Email in Mozilla Thunderbird issue

So I have a need to use any client for iCloud email and I have chosen Thunderbird. Which correctly identified iCloud setup and now I can receive mails. However I am not able to send them and no matter what I do SMTP gives warning that it can not contact server. So I have found out on many forums to check privacy and security of the mail settings and there I can see only IMAP password registered and CAD (Calendar). No SMTP

So I have been wondering whether someone has encountered this and can give me a solution.

Next question would be sending from my own domain because obviously I am using now @icloud domain. I think it can be solved with identities however there needs to be SMTP set up as well.

Thank you