https://easylettersender.click2mail.com/
Send a full-color 1-page letter or glossy picture postcard for free. Simply create an account and use one of the following codes: 1FREEL (letter) or 1FREEP (postcard).
What a GREAT idea. My mom isn't much of an email person and I never seen to get to the post office. This is a service I would actually use regularly.