The other Apple 14 opened the unknown sender to send a message. Can the other party receive it?

I can't. Apple 14 mobile phone has turned on the function of "filtering unknown senders". This function is to protect users from spam. When there is a short message from an unknown sender, it will be automatically filtered into "deleted" mail and will not be displayed in the inbox. Therefore, the other Apple 14 opened the message sent by the unknown sender, and the other party could not receive it.