set default sending account in mail app

hello all, first post at MacRumors and hope I can get some help!

i have 2 mail accounts setup, one is gmail(my mail account) and i have it forwarded to the other exchange push mail account(cannot manually set SMTP outgoing server). When I reply or send email, I would like to do it through my Gmail account. Now I know that i can just choose it from the "Cc/Bcc, From:" field to select the account i want to send it through, but sometimes I forget and it is quite troublesome to do it for every email I send.

So is there anyway i can just permanently set the send account to gmail? I've looked into the com.apple.mobilemail.plist file but I have no idea where to edit or if this is even possible, although theoretically it should be...


please share any helpful info you may have on this. thanks!