class UserMailer < ActionMailer::Base

  default :from => "notifications@audiofu.com",
          :reply_to => "notifications@audiofu.com"

  def send_fb_like_email(user, page)
    @user = user
    mail(:to => "#{@user.email}", :subject => "Someone has just liked your page")
  end

  def send_fb_comment_email(user, page)
    @user = user
    mail(:to => "#{@user.email}", :subject => "Someone has just commented on your page")
  end

end

.....

in the controller:

UserMailer.delay.send_fb_like_email(user, page)