mail.rb

 config.action_mailer.default_url_options = { :host => 'muhammet.com' }
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
      :address              => "smtp.gmail.com",
      :port                 => 587,
      :domain               => 'gmail.com',
      :user_name            => '[email protected]',
      :password             => 'ab2014',
      :authentication       => 'plain',
      :enable_starttls_auto => true
  }