Emails in particular are annoying for read receipts, at least on outlook, read confirmations are their own mail, and don't pool so anytime you have to send some

Emails in particular are annoying for read receipts, at least on outlook, read confirmations are their own mail, and don't pool so anytime you have to send something with more than a few recipients you're setting yourself to get spammed randomly whenever they feel like it and since it's opt in per mail, you can't actually trust it