Action Mailer Confirmation Emails - Ruby on Rails

I have successfully installed the Clearance Gem from ThoughtBot. Clearance sends a confirmation email upon a new sign_up and suggests adding:

config.action_mailer.default_url_options = { :host => 'localhost:3000' }

to your /environments/test.rb and development.rb. I have tried this and also

config.action_mailer.default_url_options = { :host => '127.0.0.1', :port => 3000 }

But can't seem to get rails to send the email. As I am new to both Ruby and Rails, I am wondering if there is some step/config that ThoughtBot is assuming I have already done to send emails.

What am I doing wrong/missing?

UPDATE: Just added notifier.rb

class Notifier < ActionMailer::Base
 def signup_notification(recipient)
  recipients recipient.email_address_with_name
       bcc        ["example@gmail.com"]
       from       "example@example.com"
       subject    "New account information"
       body    开发者_如何学Go   :account => recipient
     end

end

I had to generate the user mailer model.

script/generate mailer UserMailer