If the average reader of your appeal letters/emails reads only the first paragraph and then looks to the bottom of the page before deciding to spend any more time on it, be sure you’re working that bottom-of-the-page position.
Whoever designs your letter may suggest a different font for a postscript or a “handwritten” marginal note, but it’s your job to see that this special visual element works!
The reason we use “handwriting” in direct mail letters is to draw the reader in. If it distracts, or is hard to decipher, you’re wasting your effort.