How do you use Mailgun in the Heroku production environment for transactional emails?
I’ve already successfully implemented SendGrid for transactional emails. I’ve written up the whole procedure at https://gist.github.com/jhsu802701/a7ac8d4ccdc5d993a61a9de293f104df .
What’s the proper procedure for using Mailgun? There’s something missing from Heroku’s procedure. I’ve tried changing the config/environments/production.rb file, but the production email still doesn’t work. The project in question is at https://github.com/jhsu802701/tmp-heroku-2017-02-09-1833 .