This is definitely hint-worthy. One of the really great features that I missed in Lion is back in Mountain Lion. Originally described in this hint
, you can set keyboard shortcuts for outgoing e-mail accounts.
Go to the Keyboard pane of System Preferences, then click on Application Shortcuts. Click on the + icon, and choose Mail from the Application menu. Then, enter the exact name of your account as it appears in the From popup menu when you create a new message. It will look like this:
First_name Last_name <my_email@my_host>
Make sure to include the angle brackets, and put a space before the first one. Choose a shortcut -- I chose Command-Option-Control and a letter for each account -- then click Add.
To use this, create a new message in Mail. If the default account isn't the one you want, just press your shortcut to set the message to go from a different account. You can set shortcuts for all you accounts, or merely one or two, if you have a lot.