gistfile1.rb

# First, specify the Host that we will be using later for user_notifier.rb
HOST = 'http://www.yourrailsapp.com'

# Second, add the :user_observer
Rails::Initializer.run do |config|
  # The user observer goes inside the Rails::Initializer block
  config.active_record.observers = :user_observer
end

# Third, add your SMTP settings
ActionMailer::Base.delivery_method = :smtp
ActionMailer::Base.smtp_settings = {
  :address => "mail.yourrailsapp.com",
  :port => 25,
  :domain => "mail.yourrailsapp.com",
  :user_name => "[email protected]",
  :password => "yourrailsapp",
  :authentication => :login
}