THis has happened to me multiple times. I once even send a job application to a different person. INterestingly, the person replied back, "please check your sender details and send it to the right person".
I have had this happen to me on many occasions and it is usually that something gets said and I instantly fire back but because I am angry about it, I just go for it without thinking. I never say anything stupidly bad but what I say I usually sit back and think to myself "That was probably too harsh" and I regret it.