At scale, all of these things can be automated. The challenge is getting to scale but not getting destroyed by someone who already has the infrastructure to do

At scale, all of these things can be automated. The challenge is getting to scale but not getting destroyed by someone who already has the infrastructure to do this at far lower cost. (Vistaprint, for example, could probably offer this service with just a little bit of programming work.) To avoid that, you'll want to offer users whatever you can to make your service a more efficient option: address book integration, built-in letterhead, quickbooks integration, who knows. You might also expand to adjacent markets. I once heard of an online greeting card company that lets you enter in the addresses and birthdays of everyone you want to send cards to. Then a couple weeks before each birthday, they mail you an envelope containing a pre-addressed, stamped envelope with your choice of card. You just write a note and drop it in the mail. You could do the same sort of thing, maybe even including the handwritten part!