I need to configure Exchange 2013 to use my email providers settings as a smarthost to be used in a send connector. So far I have tried configuring the hostname with authentication and the right port but TLS / SSL doesn't seem to get enabled.
Here are the SMTP settings from the provider (Fastmail)
SSL/TLS Encryption: Enabled (but not STARTTLS)
Authentication: PLAIN (Our SMTP ports are for authenticated SMTP only; you'll need to make sure your software supports authenticated SMTP and also set up a username and password)
Username: your FastMail username/login name/email address (must include @fastmail.fm part)
Password: your FastMail password
Alternatively, if you're client supports STARTTLS only, you can use port 587 with STARTTLS enabled.