Originally Posted by
Denolloyd
Wirelessly posted (iPhone 3G: Mozilla/5.0 (iPhone; CPU iPhone OS 7_1 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) Version/7.0 Mobile/11D167 Safari/9537.53)
For iMessages, they will see the status of the message, which includes delivered, read, and I believe sent.
Delivered=sent for iMessages.
Read will only be shown if the recipient has that enabled on their device, otherwise it will always just say delivered. There's no difference in this behaviour if do not disturb is turned on/off.