Thunderbird
My first email client I have ever used was Eudora. I found it very useful until I decided to try one of Mozilla’s products, Thunderbird. It is a very nice and organized email client that is very simple to setup and use. When setting up an email account, it takes you through step by step and is simple for anyone to use. I primarily use it to get email from my websites on my server. There is a plug-in for Thunderbird called Webmail where you can even add accounts like AOL, Yahoo, Hotmail and many more. If you are looking for a easy to use email client with a nice and simple interface, Thunderbird is for you.