Hi, Kindly ignore the message I sent earlier because I have sent it by mistake. Thank you for your understanding. === Also, just to correct your question, see below. Hello! If I sent a message to the wrong person, what should I say to him/her?

I am really sorry, I sent you this message by mistake. I am really sorry, I accidently sent you that message. It was not ment to be send to you. I am so sorry. It was an accident you got that messsage. Hey, sorry. You got this message by accident.

You should say "sorry i sent a text to you saying how stupid you are. I meant to send it to Bob who also thinks ypu are an idiot ."

some people would simply say "sorry wrong chat"