1. Click Mail on the Dock or open it from the Applications folder.
2. If the Welcome to Mail assistant does not appear, choose Add Account from the File menu.
3. Fill in the Full Name, Email address, and Password fields.
   
   Note: Your email account password will be stored in Keychain to allow you to automatically log in to your email account when you open Mail.
4. Deselect Automatically set up account if it is enabled. Click Continue to proceed.
5. Choose POP from the Account Type.
6. Give your account a useful description, such as "Northwestel account".
7. Enter your Incoming Mail Server, User Name and Password. Click Continue to proceed.
   
8. For Outgoing Mail Server, enter a useful description such as "Northwestel Outgoing Mail Server".
9. Enter the Outgoing Mail Server details.
   
10. Verify your settings in the Account Summary. Check Take account online.
11. Click Create to complete the process.
    

Repeat steps for each additional email account.