mail()
private

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# File actionmailbox/app/controllers/action_mailbox/ingresses/sendgrid/inbound_emails_controller.rb, line 59
      def mail
        params.require(:email).tap do |raw_email|
          envelope["to"].each { |to| raw_email.prepend("X-Original-To: ", to, "\n") } if params.key?(:envelope)
        end
      end