1. Open up Mail.app and press Command+Comma to invoke the Preferences window.
2. Switch to the "Accounts" pane and press the + button in the lower-left corner.
3. Under "Account Information", fill out the following information:
   • Account Type: POP or IMAP
   • Email Address: email-name@your-domain-name.com
   • Incoming Mail Server: mail.your-domain-name.com
   • Username: email-name@your-domain-name.com
   • Password: your email password
   • Note that POP uses port 110 and IMAP uses port 143
4. Select "Add Server..." from the Outgoing Mail Server (SMTP)pop-up menu. Here are the details for it:
   • Outgoing Mail Server: mail.your-domain-name.com
   • Server port: The port number we provided for your account
   • Use Secure Sockets Layer (SSL): No
   • Authentication: password
   • User Name: email-name@your-domain-name.com
   • Password: your email password
   • Dismiss the window by pressing "OK."
5. Back in the "Accounts" pane, switch to the "Advanced" tab and do not check the box marked "Use SSL" towards the bottom.