@jimcarroll @molly0xfff Here's how my config differs:
1. Add "logger": true, to options. I guess it adds more logging.
2. host: "smtp.mailgun.org". Not sure if that makes a difference.
3. "port": 465, Notice no quotes as well. Not sure if these differences should matter.
If you are getting JSON validation errors, you should post those, it looks OK to me.