Monit notifications using Google Gmail SMTP

I had to do a bunch of fiddling around to figure this out, hence a quick blog post. The situation: I want monit to send me email notifications and I don't have (or want) an SMTP server running on the box. Furthermore, like many ISPs, my ISP won't allow outbound connections to port 25 anyway. Solution: as a Gmail user, I can use Google's SMTP servers for sending mail. You need monit version >= 4.10