```ruby
class ApplicationMailer < ActionMailer::Base
  default from: "Rails Girls Kraków <#{Rails.application.secrets.mandrill('sender_email')}>"
  layout 'mailer'
end
```

Fix issue with retrieving email sender from secrets
user
```ruby
class ApplicationMailer < ActionMailer::Base
  default from: "Rails Girls Kraków <#{Rails.application.secrets.mandrill['sender_email']}>"
  layout 'mailer'
end
```
assistant