Earlier quoted context omitted.
Yep, for important written communications (e.g. CRAs, the IRS, debt collectors, etc.) I always use certified mail and request a return receipt. For any clueless millennials such as myself who are unfamiliar with the post office, this is a good video that shows exactly how to fill out the forms: https://www.youtube.com/watch?v=YLQLWdV1MZE
Thanks for the video. Curious why they say never to sign the letter.
0 - Using such fancy Merlin's wands of "Photoshop" or "scanning and then MS Paint copy/paste" or just "photocopy, cut with scissors, paste with tape, photocopy again."