If you have several different email accounts, you may find it annoying to have to choose the right email address as your “From” email from the drop-down menu (providing the default send account isn’t the one you want to use) in OS X’s Mail app. There is no cure for this problem, but you can at least put the list in the order you want it to appear in.
I’ve seen other Mac sites that offer tips to accomplish this that range from the outrageous advice that you must delete all your email accounts and re-add them in the order you want them to appear, to the less dramatic but still cumbersome idea that you must uncheck the email checkbox in the Internet accounts preference pane and re-enable email in the desired order.
Thankfully, there’s a much more convenient way to accomplish the same desired result that doesn’t require you to delete anything.
Simply drag the individual email inbox icons for your accounts in the Mail sidebar to the order you want them to appear and restart Mail. Boom, you’re done. Now your drop-down menu will list your email addresses in the order you set them in.