Mozilla Thunderbird is an opensource email client and it is a very good alternative of MAC Mail. You can download Thunderbird from the official website of the application.
When you open that page from your browser, click "Download Thunderbird" and save the .dmg installation package to your local computer. Then you should double-click on the saved file and follow the on-screen instructions to complete the installation.
In order to setup Mozilla on your MAC you will also need a valid email account, which you can create from the “Email Accounts” section in your cPanel as shown in this tutorial.
For setting up your email account in Thunderbird, you should follow these steps:
1) When you launch Thunderbird for the first time the Account Wizard should start automatically. In that case, skip to step 2 below. If it does not, open the File menu, then click on New, then "Account...".
2) The first screen asks what kind of account you want to set up. The default "Email account" is correct, so just click Next.
3) Type in your name as you want it to appear on outgoing email in the Your Name box. Type in your email address in the form “your.account@yourdomain.com” where your.account is the name of the email account and yourdomain.com should be replaced with your actual domain name. Then click Next.
4) Change the incoming server type to POP or IMAP depending on your needs. IMAP is a great choice for users who wish to check their mail from different computers, while POP is suitable if you are going to use e-mail only from one location, such as your home or office, because all your e-mail activities are performed on your local workstation.
In the Incoming Server box, type mail.yourdomain.com, where yourdomain.com is your actual domain name. The same goes for theOutgoing server.
5) Enter your full email address as the Incoming User Name
6) You will then be asked to name your account. You can leave the default, which is your email address, or change it. Then click Next.
7) The final screen summarizes the information that you just entered. Verify that it is correct and then click Finish.
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