```ruby
class UserMailer < ActionMailer::Base
    default from: "UltimateBundles <customerservice@ultimate-bundles.com>"

    def signup_email(user)
        @user = user
        mail(:to => user.email, :subject => "Your Mini Video-ecourse")
    end
end
```

Tweak to user mailer subject line
user
```ruby
class UserMailer < ActionMailer::Base
    default from: "UltimateBundles <customerservice@ultimate-bundles.com>"

    def signup_email(user)
        @user = user
        mail(:to => user.email, :subject => "Your Mini Video-eCourse")
    end
end
```
assistant