I implemented a dirty hack to handle simple userid/password authentication with an SMTP server. It's not hard to implement, but I'm still not sure how to nicely integrate it with SSTs way of configuring services. I've spent nothing on any other than simple AUTH LOGIN, because that's what I needed.
So if you need to send mails using an SMTP server that uses any kind of authorization (which is the norm with todays' SMTP servers because of spam), SST doesn't support it out of the box.
Joachim