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 .
Jason Hsu, Ruby on High Speed Rails
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Feb 9, 2017, 6:15:22 PM2/9/17
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When I enter "heroku logs", the error message I get is: Net::SMTPFatalError (554 Sandbox subdomains are for test purposes only. Please add your own domain or add the address to authorized recipients in Account Settings.