Hello all!

I currently have a mail merge where, using an excel document, I am e-mailing hundreds of people information regarding potential college degree's they have qualified for or what have you. Right now, they e-mail from my outlook e-mail account I am currently logged into. However there is another e-mail account that I have been told to e-mail from instead of my own. To do this, I have to physically go into a new e-mail in outlook, go to options, then change the from to whatever it was I wanted. Is there a way to do this same thing except without having to send each e-mail individually, having to change the from every time? Thanks, if this was unclear, please say so that I might shed some further light on this problem I'm having.