Sign up with MailGun
Add a custom domain
Please note: MailGun often requires to contact support to enable your account - a measure they have in place against abuse
- Go to https://app.mailgun.com/app/domains/new and enter your domain, ideally a subdomain, e.g.
- Then follow the steps provided to verify and configure your domain
Update your MailGun configuration in Heroku
See also Heroku