Sending short messages in groups shows "outgoing". Is this a mass message?

This may not be true. It only means that you have successfully submitted the text message, and whether the text message is received depends on the receipt. Take the common short message platform Haoyu Information Communication as an example. After sending a short message, there is an accurate real-time short message report, from which you can see whether it is a success or a failure and why. At present, most platforms do not display real receipts, and the success you see is not necessarily success, so it is very important to find a reliable platform.