If you have GMail, you can install the GMail Drive to an external drive and make it work with a Mac. You may not even know that GMail has been made available for OS X. It is a software program designed to make emailing between email addresses easy and quick. You can send or receive files from other GMail users on your Mac.
One of the main features that allows people to install GMail Drive onto another Mac is because it offers security. The user is able to login with the password that they use to get onto their email account. This method prevents emails from anyone accessing your mail account from using it on their machine. They can not just copy and paste it into their mail client as well. It is also easy to move messages to another external drive if they move out of your main email account.
This software is also very customizable because you can change how your email account works. It will allow you to set up passwords, if you are a professional person, you can use the same password for all accounts that you use. Other features include being able to create more than one email address if you like. This means you can get updates from many people without having to constantly delete old messages. Because there is no central server for messages, they can be shared between many different computers. This makes it possible for the computer to only keep the messages that are relevant to your own computer.