1. In Outlook, click on Tools > Email Accounts.
2. Click Next on View or Change Existing Email Accounts
3. Click Add.
4. Select POP3 and click Next
5. Fill in your information.

Your Information

Your Name: Your Name
Email Address: Pop email address

Server Information

Account type: POP3
Incoming mail server - xxxx (this should fail as intended when testing)
Outgoing mail server - exchange mail server (mail.domain.com)

Logon Information

User Name (This is the email address used for login credentials (exchange domain): ex: user@domain.com
Password: The password that is configured

6. Click on the More Settings button
7. Type the name of your pop3 domain and the reply to address
8. Click on the Outgoing Server tab and check the top check box that says My outgoing server (SMTP) requires authentication
9. Click OK
10. Click Test Account Settings
11. Click Finish.
The set up is complete. The next steps prevent the errors that occur on Send and Receive.
12. In Outlook, click Tools > Options > Mail Setup tab
13. Click on the Send/Receive button
14. Check the Schedule automatic Send and Receive every 5 minutes box.
15. Highlight All Accounts and click edit
16. Select the new POP3 account that you just created, uncheck the Receive mail items.
17. Click OK > Close > OK.

That's it! In Outlook, create a new email message. Next to the send button, you will see an Accounts button with a drop down selection of the accounts on that allows you to select which email account the email comes from.