Step 1:   
On your computer, click the Start Menu and select Control Panel.

Step 2:
If using Windows XP, double-click the Mail icon.
If using Windows Vista, Windows 7 or above, type Mail into the search box at the top-right of the Control Panel window to quickly find the Mail icon. Then, double-click it.

Step 3:
Click the Email Accounts button.

Step 4:
Under the Email tab, click the New button to add your e-mail account.

Step 5:
Check the box for Manually configure server settings or additional server types and then click the Next button.

Step 6:
Select the Internet Email type of account and then click the Next button.

Step 7:
Select IMAP from the Account Type drop-down box.

Step 8:
Enter Your Name. This is the name that will appear when others receive your e-mail.
Enter your email address.
Make sure that IMAP is selected from the Account Type drop-down box.
Enter mail.yourdomain.com as the Incoming mail server.
Enter smtp.yourdomain.com as the Outgoing mail server (SMTP).
Enter your full e-mail address as the User Name.
Enter the e-mail account’s Password.
Check the box for Remember password if you do not want to enter your password every time you check or send mail from this account.
Click the More Settings button.

Step 9:
Select the Outgoing Server tab from the top of the new window that opens.

Step 10:
Check the box for My outgoing server (SMTP) requires authentication and ensure that Use same settings as my incoming mail server is selected.

Next, click the Advanced tab at the top of the window.

Step 11:
Enter port “143” as the Incoming server (IMAP) port and ensure that “None” is chosen from the Use the following type of encrypted connection drop-down box.

Step 12:
Choose “None” from the drop-down box next to Use the following type of encrypted connection and enter 25  or 587 as the Outgoing server (SMTP) port.
Click the OK button to save your settings.

Step 13:
Now you can click the Test Account Settings button to verify that the e-mail account can send and receive mail.

Step 14:
If the part of the test fails, go through the previous steps and double-check all of your settings in Outlook. If the test is successful, click the Close button.

Step 15:
Click the Next button.

Step 16:
Click the Finish button.

Step 17:
You may now launch Outlook 2007 and begin writing and checking your mail!