What does the other party regard as spam messages?

Has been sent as spam to the other party for viewing.

But it will not be displayed in the normal information bar of the other party.

, which will be displayed in the mask information. If the other party can open the blocked message bar, they can see your message. But if the other party doesn't open it, they can't see it, and the mobile phone system will be kept as spam for a while and then deleted.