如何使用Devise向Rails中的新注册用户发送欢迎电子邮件？

I am using Devise on Rails and I'm wondering if there is a hook or a filter that I can use to add a bit of code to Devise's user registration process and send a welcome email to the user after an account has been created. Without Devise it would be something like this...I am using Devise on Rails and I'm wondering if