Missing possibility to set up SMTP.

I cannot send e-mails. I have set up an account but there is no possibility to setup SMTP. There is just general settings/IMAP/Diagnostics. Can you help why?
I set up also Gmail and there was everything IMAP/SMTP…but I need to send e-mails from the first e-mail address.

Try to re-create the account manually: Open Tools - Accounts - New account - Mail - Other - next and follow the instructions on the screen. You should be able to configure SMTP server without any problems (unless your server does not support it).