Just copy the user_mailers inside your Mailers directory and then inside user_mailers views move welcome_email_to_player.html.haml. Then user UserMailer.welcome_email_to_player.deliver. tada.... Your mail is sent. For out just check this test yomail account => [email protected].

user_mailer.rb

class UserMailer < ActionMailer::Base
  default :from => "[email protected]"
  def welcome_email_to_player
    attachments.inline['user_back'] = {
        :data => File.read("#{Rails.root.to_s + '/app/assets/images/bg.jpg'}"),
        :mime_type => "image/jpg",
        :encoding => "base64"
    }
    mail(:to => "[email protected]", :subject => "Welcome to here")
  end
end

welcome_email_to_player.html.haml

This is test email for sending the email
= image_tag( attachments['user_back'].url)