Please come and look at the information receipt. Thank you.

If you turn on the short message receipt, then no matter whether the other party blacked you out or not, as long as the other party's mobile phone has a signal (meaning it is not turned off or out of service area), then your short message can be sent, and his mobile phone will receive your short message, and you will also receive a successful receipt. Although the message was blocked after he blacked you out, he did "receive" your message, but his mobile phone would put your message in the blacklist inbox instead of the inbox.

So, to sum up, even if he blacked you out, you can still send your message to his mobile phone, and the message receipt will prompt that the message was sent successfully, but he can't see the message. In other words, sending a message receipt prompt successfully does not mean that he has not filtered your message.