Please setup your mail account(s) in cPanel by going to
https://yourdomain.com:2083 and then under the email
section click manage accounts.
To configure email accounts manually:
1. Select Accounts from the Tools pull-down menu.

2. You will see a listing of all the different accounts that you
have Outlook Express configured to use.
Click on Add... and select Mail... to add a new e-mail account.
3. Input your display name.
When you send email, your name will appear in the From field of the outgoing message.
Type your name, as you would like it to appear. This can be anything
and is not critical. Click next.
4. Input your email address that you will use for this account.
Click next.
5. Configure email server names.
a. My incoming mail server is a POP3 server.
b. Incoming mail server is mail.yourdomain.com
c. Outgoing mail server is mail.yourdomain.com Click next.

6. Input your username and password.
7. Click Finish.
8. Verify settings.
Go to Tools --> Accounts and then select the email account you just setup.
Click Properties on the right side. Click the servers tab to get this screen.
Verify these settings are correct and click My server requires authentication.
9. Click the settings tab.
10. Click "Log on using" and input your account name (full email address) and password. Click OK.
11. If you have problems sending mail out but not with receiving, try changing your outgoing mail server port number to port 26. This can be found under the advanced tab, The default is 25.
Some ISP's do not allow mail to be sent out on port 25 (A spam deterrence). Innerplanet provides an additional port on 26 for this reason.