This past week I've been on the receiving end of this from multiple vendors who send quickbooks invoices. I get the original invoice emailed TWICE. If any reminders are sent they come twice too. This is for several different bookkeeping clients of mine and all different kinds of vendors, so it's clearly a problem with QBO, and not user error on the vendor end. It's super annoying to have all my inboxes cluttered up with duplicates. Anyone else seeing this lately?