I turned on email debug again and saw your smtp server was giving an encryption error. So I turned off your email encryption settings and that seems to have fixed it.
Now the email sends, but I get an error because you have email logging turned on and set to insert into the email_log table in your database, but that table doesn't exist. You can either delete lines 55-62 to remove the logging, or create the table in the database so it can insert properly.