Judge whether SMS delivery is valid?

The judgment can be served by post, which means that the documents served by the people's court through the post office are delivered to the addressee by registered mail. Practice shows that court mail service is usually a way of service when the addressee's residence is far from the court and it is difficult to deliver it directly. According to Article 85 of the Opinions, if it is delivered by post, it shall be accompanied by a receipt of service. If the date of receipt indicated on the registered letter receipt is inconsistent with the date of receipt indicated on the delivery receipt, or if the delivery receipt is not sent back, the date of receipt indicated on the registered letter receipt shall be the date of delivery.