In the case of Outlook, read receipts are a thing if the sender wants at least an acknowledgement. True that the receiver can just click no on the option to send that receipt, but presumably they’re also the type that wouldn’t have sent a reaction to the email in the first place.
I will say, it’s practical for everyone using the same system. Sometimes it’s nice to acknowledge an email without having to respond to it
And when I had my school account, they’d send out phishing alerts of what to look out for. Those emails would be spammed with crying laughing emojis
In the case of Outlook, read receipts are a thing if the sender wants at least an acknowledgement. True that the receiver can just click no on the option to send that receipt, but presumably they’re also the type that wouldn’t have sent a reaction to the email in the first place.