Postal savings remittance is to send me a text message after the other post office receives the money, or to send me a text message after the payee withdraws the money?

Postal short message service, with or without it, is actually an almost redundant service. It's just a little more money for you personally, and postal services will increase your income. I think the message you received may tell you that your remittance has been remitted, and it will never tell you that the payee has taken the money. Remember that you don't need this business in the future. You have already remitted the money. Just send a message to the payee in a few days.