I have six rental properties as a landlord and I use Bank of America small business accounts which have an email payment system using ACH. The tenant receives an automated email invoice and can pay the invoice by ACH with a few clicks after a one-time setup. I receive an email from the bank when they have paid. It's completely paperless. No other bank was offering this at the time I set it up a few years ago. It's been working great except for the few luddite tenants who can't seem to get the simple setup to work. For them, I have them send a check to a B of A PO box and the bank processes the check for me.