Mail.App

Setting up your forwarding address on Mac's built-in Mail application is very easy, if you know how. Fortunately, you will know how, after reading this quick set of instructions.

1. Open Mail.
2. Go to the Mail menu, and select "Preferences".
3. Click the Accounts button, and select your primary email account.
4. The field labeled "Email Address" is processed, actually, as a comma-separated list of addresses. So, just add a comma and your End Slavery Now forwarding address, as below; then close the window, saving your changes, and you're ready to go.
5. The next time you send an email, you'll find that you can choose whether to use your original account identity or your End Slavery Now forwarding address by choosing the address in the From dropdown.