For Outgoing Server (SMTP) for an otenet email address mine has:
1 The server set to mailgate.otenet.gr
2 Port set to 465, which is the default
3 User Name set to the email address, e.g. email@example.com
4 Authentication method set to Normal password
5 Connection security set to SSL/TLS
I have a number of non-otenet accounts and the settings for them are different. It depends who is providing your email service.