Last year there was a discussion about someone making a setup to send handwritten plotted letters here: https://news.ycombinator.com/item?id=28587458

I noticed some similar letters several years ago and had a pretty negative response once I figured it out. But these might be enough better I wouldn't notice unless of course I see another one like you did.

https://www.audience.co/did-you-receive-a-fake-handwritten-n...