I am trying to send an email to someone and it keeps coming to my own inbox

I am trying to send an email to someone and it keeps coming to my inbox that i have just sent it from. I cannot understand why this is happening. It isnot addressed to me but from me addressed to someone else but that does not stop it coming straight back to my inbox. At first I really wondered if I had sent it to myself but definitely did not. I would be rtateful fir any advice. It is an old hotmail address that has changed to the outlook umbrella [ and an inconvenient umbrella that has constantly been]. regaards, Sheraya.