Delayed delivery if the receipient is presenting/in meeting/away
Delayed delivery if the recipient is presenting/in meeting; it should not disturb his presentation/meeting. I think adding one more 'Send Button' will solve the problem.
Another issue is even if I send messages at odd time like nights, prefer to receive when they come available. Because, since many people keep the app in phone, I don't want to receive the message as a disturbance.