Step 1 » Open Outlook. From the file menu, select Info and choose Add Account. Note: If you just installed Outlook, a setup wizard will appear allowing you to bypass this step.
Step 2 » Select "Manually configure server settings or additional server types". Click Next.
Step 3 » Select Internet E-mail and click Next.
Step 4 » Select IMAP Account Type & enter your email settings. Server Address: mail.yourdomain.com / User Name: firstname.lastname@example.org
Step 5 » Click More Settings and select the Outgoing Server tab. Check the box labeled "My outgoing server (SMTP) requires authentication."
Step 6 » Select the Advanced tab and change the Outgoing server (SMTP) port number to 587. Click OK.
Step 7 » Click Next to test your account settings. When the test has completed successfully, click Close.
Step 8 » Your mailbox is now ready to use. Click Finish to return to your Outlook inbox.