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 “General” window.

4. The “Accounts” window will now appear. Select your PenTeleData email account from the “Accounts” list on the left if it is not already selected. Click on the “Outgoing Mail Server (SMTP):” drop down menu.

5. Click on “Edit Server List….”

6. Select “promail.ptd.net” if it is not already selected. Then click the “Advanced” tab.

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

8. Click on the close button.

9. You will be prompted to save your changes, click “Save.”