Using ActionMailer for internal messaging

gistfile1.rb

class UserNotifier < ActionMailer::Base
  # sample message
  def some_message(user)
    from %Q{"Internal Messaging System"}
    recipients user.email
    subject "This is internal message"
    body :user => user
  end

  # sample message notification
  def message_notification(message)
    from %Q{"MyAppName.com mailer"}
    recipients message.recipient.email
    subject "You've new message in your inbox"
    body :user => user
  end

  private

  # if the called method has "deliver_internal_"
  # prefix, use notify method to deliver message
  def self.method_missing(method_name, *args)
    if method_name.to_s =~ /^deliver_internal_([_a-z]\w*)/
      new($1, *args).send(:deliver_internal)
    else
      super
    end
  end

  # deliver message to user using internal messaging
  def deliver_internal
    users = User.find_all_by_email(@mail.to)
    from = @mail.from.first[1..-2] # remove quotes
    users.each do |user|
      Message.create!(:recipient => user,
                      :subject => @mail.subject,
                      :body => @mail.body,
                      :sender_name => from)
    end
  end
end

gistfile2.rb

class Message < ActiveRecord::Base
  after_create :deliver_notification
  belongs_to :recipient, :class_name => "User"

  private

  def deliver_notification
    # deliver message notification email (external)
    # if the user wants it
    if recipient.wants_message_notifications?
      UserNotifier.deliver_message_notification(self)
    end
  end
end