[Animats]

Artisanal spam. Why not?

It's not a new idea, though. The direct mail industry already does this. See

  http://www.getitopened.com/

"NEW! Use our proprietary technology to hand-address your envelopes! We specialize in production methods for high volume mailers that will incorporate realistic hand addressing at a fraction of what it would cost to contract a workroom to do the job. Simulated fonts made from real handwriting samples are also available."

They can also put stamps on slightly crooked so it looks hand-mailed, have hand-written sticky notes attached to the contents, or include a hand-written letter on yellow lined paper.