I vote for this. Any mail client can do that why protonmail can't? It's always the responsibility of the sender to accept the acknowledgement. And if he doesn't want, fair enough, at least you should be able to know that your message has reached its destination. There's nothing against privacy in this, you already know you have sent an email to the recipient !
I vote for this. Any mail client can do that why protonmail can't? It's always the responsibility of the sender to accept the acknowledgement. And if he doesn't want, fair enough, at least you should be able to know that your message has reached its destination. There's nothing against privacy in this, you already know you have sent an email to the recipient !