Meeting codes sent from wrong email address

My meeting codes go out fine and I can connect.  But... the email address that it is sent from is my personal email address (a hotmail one) and not the one that I keep all my professional work on. And I can't see why this is happening as that email address is not in my profile or any setting I can see. Anyone know how to change it? 
It causes problems as clients then email me back at that address and I don't see the material in a timely manner.
Thanks