Email is one of those rare holdovers from the dawn of the Internet that continues to have practical applications to our everyday lives. Through constant challenges from the likes of tweets and text messages as the preferred means of relaying information to a friend or colleague, email has remained as useful as ever. Like any other technology, email has its limitations, but with the help of a couple of easy to use apps, you can turn your inbox into a beacon of productivity and efficiency. Here are a few useful apps you should be using for your emails right now.   Moveable Ink Thanks to the proliferation…