Step 1: Open Outlook 2010 and select File
Step 2: Click Add Account.
Step 3: Check Manually configure server settings or additional server types
Step 4: Manually configure server settings in Outlook 2010
Step 5: Select Internet E-mail
Step 6: Fill in the fields on the screen

++++
Account Type: Select IMAP
Incoming: mail.domain.com   (or)  hostname
Outgoing: mail.domain.com    (or)  hostname

Select IMAP after the Incoming mail server name.
User Name: Enter in the full email address
Password: Enter in the password for that specific email address
+++
Note: Use your domain name in domain.com field

Step 7: Click More Settings
Step 8: Select Outgoing Server and then My outgoing server (SMTP) requires authentication

+++
Select Advanced.
For IMAP use 143 - SSL Disabled      ( If SSL enabled Use 993)
Outgoing SMTP port - 25 or 587 or 26 ( If SSL enabled use 465)
For Root folder path enter INBOX with uppercase letters.
+++

Step 9: Click “Next†and then click “Finish†to complete the email account setup.