You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: email_invitation_concern.rb
    path of file: ./repos/coursemology2/app/services/concerns/course/user_invitation_service
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# This concern d
    
  def send_registered_emails(registered_users)
    registered_users.each do |user|
      Course::Mailer.user_added_email(user).deliver_later
    end

    true
  end