Can Apple Mail ask me to choose an outgoing email address each time?

I'm familiar with the settings for outgoing accounts (i.e. let Mail choose the best, or manually select the default) but I am desperately searching for a setting, plug-in or hack that will have Mail ask me each time to select which account. Is there anything out there? The issue is that if I'm in a hurry and click "new email" I forget to check which account it's sending from, and some clients get emails from me at a different company name where I subcontract.

Maybe there's a way to simply setup a dummy or blank email account so it will fail to send unless I select the right account? (I'm struggling to figure this out since it needs to verify the settings of a new account.)

Any other ideas or solutions (or plug-ins/add-ons) to this dilemma? Thanks!