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actionmailer2.rb

module MailObserver
  def self.delivered_email(mail)
    logger = ActionMailer::Base.logger
    logger.tagged(mail.message_id) do
      logger.info do
        recipients = Array(mail.to).join(', ')
        "Sent mail to #{recipients}"
      end
    end
    logger.debug { mail.encoded }
  end
end
ActionMailer::Base.register_observer(MailObserver)
 
module MailLogSubscriber
  def deliver(event)
    # no-op
  end
end
ActionMailer::LogSubscriber.prepend(MailLogSubscriber)