In mail.app I have it setup to use 2 email accounts, one is my personal email account and the other is my business account. How do I set it so that when I create a new email it'll always default to being sent my personal email account rather than my business account? At the same time, I want it setup so that when an email comes into my business account and I hit "reply" to that business email I obviously want that reply to be sent out from my business account. How the heck do I do this? I looked through all the preferences and account settings and I couldn't figure it out. Help!