I also figured that it would be more authentic with my signature and handwriting on the envelope (the letter is printed in handwriting font and then I sign it). 

Here are some examples:Yellow Letter- yellow lined paper with handwritten font in envelope with live stamp.Text Postcard- double sided postcard on card stock, indicia stamp.Zip Letter- Pressure sealed, perforated, tear to open mailer.What are the benefits and drawbacks of each, and where in the process do you use each one?

I plan on sending white 4x6 postcards with a handwritten, red font which i am printing myself for now.

In a mass mailing I haven't seen TOO much of a difference in response rates between human handwritten and handwritten font, therefore, I tend to recommend the cheaper and faster route of handwritten font.

(Insert sarcasm font)What's funny is, the politicians will use this report to tax the hell out of these short-term rentals, and then what?

For example I know the font State Farm agents use, so I trash those without opening. 

They are usually printed in a handwritten font and basically ask the question, 'are you looking to sell your house?'. 

Generally speaking, I also think the font-sizes are too big.Just my .02 cents.

Did you send a breach notice to him certified, and in the requisite font type and size on your letter?

If you have handwriting that isn't very legible, you should consider using a handwriting font that mimics real handwriting if you're going for that authentic feel to the letter2.