```ruby
class ApplicationMailer < ActionMailer::Base
  default from: ENV['MAILGUN_FROM_EMAIL']
  layout 'mailer'
end
```

Add roadie to inline CSS for emails
user
```ruby
class ApplicationMailer < ActionMailer::Base
  include Roadie::Rails::Automatic

  default from: ENV['MAILGUN_FROM_EMAIL']
  layout 'mailer'
end
```
assistant