Step 1: Open Thunderbird and select the Tools menu. Click the Account Settings tab
Step 2. From the new window select the Add Account button, then E-mail account and click Next.
Step 3: Enter your name as you would like it to appear in the From: field of all outgoing mail and the email address which the others will use to send email messages to you. Click Next.
Step 4: Please set the incoming server to be of type POP. Address is yourdomain.com
Step 5: Click Next and type in the username. Please use the full e-mail account name. Example: firstname.lastname@example.org instead of you.
Step 6: After clicking the Next button, please type in the name of the e-mail account as it will appear on your PC. Click Next, and then the Finish button.
Step 7: Click the Outgoing Server(SMTP) in the left pane. Use yourdomain.com as Server name set the port to be 2525.
Then, check Username and password and enter the full e-mail address as username. Select No in the Use secure connection section.
Step 8: Click OK and you are done!