Send iMessage or SMS after setting the number to block this incoming call. Can the other party still receive it? What do you mean by showing delivered?

The other party can receive it. You blocked the other party's number, and the other party did not block your number. Show that it has been sent, indicating that the other party has received the iMessage or SMS you sent.

IMessage is an instant messaging software launched by Apple, which can send short messages, videos and so on. It has high security. Different from the SMS/MMS service of operators, users only need to support data through WiFi or cellular data network to complete communication.

Features:

With iMessage, you can send and receive information to anyone who uses iPad, iPhone, iPod touch or Mac users who run Mountain Lion, as well as send photos, videos, location information and contact information. If you have more than one Apple device, iMessage can keep continuous conversations on all devices, and you can send text messages, photos and videos to other mobile phones through the cellular network, and even let Siri send text messages for you. Just say "Tell Xiaoli I'm on my way" and Siri will help you write and send messages.