Mozilla Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features! You can download the latest copy here. You can use Thunderbird to access your mail accounts in your computer instead of using web mail. IMAP and POP3 are supported.
STEP 1 Open Thunderbird and select the Tools menu. Select Account Settings.
STEP 2 From the new window click on Account Actions and choose Add Mail Account.
STEP 3 Enter your name as you would like it to appear in the Your Name: field and your email address. Also supply the password for this email account. Then click Continue.
STEP 4 At this point Thunderbird will attempt to automatically detect and finalize the configuration for your incoming and outgoing server settings. Let the automatic configuration utility finish.
STEP 5 Set the Incoming protocol to either POP or IMAP according to your preferences then click Manual Config.
STEP 6 Change the username to the full email address for which you are setting up the account (i.e. firstname.lastname@example.org). Make sure that this account has already been setup in your cPanel Mail Accounts.
STEP 7 The ports are default - 143 for IMAP and 110 for POP3.
STEP 8 For Outgoing server select mail.yourdomainname.com. The default SMTP port is 587 or 25, but you can also use 26 if your ISP has blocked port 587 or 25 for outgoing mails.
STEP 9 Click Re-test Configuration. If everything is entered correctly and no errors were being shown, click Done.
STEP 10 If a security popup is shown asking you to override how Thunderbird identifies your account, click "Confirm Security Exception" and close the configuration window.