1. Open Mac Mail by double-clicking the "Mail” alias on your "Desktop" or by clicking the "Mail” icon in the "Dock." You can also open Mail by selecting "Applications" from the "Go" menu at the top.

2. Select “Preferences…” from the “Mail” Menu at the top.

3. Click on the “Accounts” button on the preferences window. Select your PenTeleData email account from the “Accounts” window. Click on “Server Settings…” to continue.

4. Change the “Server port:” to “587” and click “OK.”

5. Click on the close button.