Sign up with MailGun

​https://signup.mailgun.com/new/signup​

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. mg.yourdomain.org

• Then follow the steps provided to verify and configure your domain

Update your MailGun configuration in Heroku

• MAILGUN_API_KEY

• MAILGUN_DOMAIN

• MAILGUN_SMTP_LOGIN

• MAILGUN_SMTP_PASSWORD

• MAILGUN_PUBLIC_KEY (from https://app.mailgun.com/app/account/security)

See also Heroku​