Hi,
I don't have Send Read Receipts set on my Mac or my iPhone.
However if I iMessages my iPhone Number from the Apple ID on the Mac I get the Delivered response.

The sync seems to play a part in this as it swaps back an forth between the IDs.

The "Test 2" was sent from the iPhone (number) but the sync versions shows the number later (it is literally moments)
The iPhone also go a "Delivered" response and this is on two IDs that are not set to send to Read responses.
I had thought it was dependent on the device you were looking at versus the ID the iMessages was sent from, but the above pick shows the sync arriving before the actual iMessages from the iPhone number and that sync version getting the delivered response even though it should only be the iPhone in my opinion.
What I do not see is any sub-messages that actually says Read... which is what it says it is supposed to do.
You get the Ellipses any time anyone types or starts to type a response.

8:50 p.m. Monday; October 12, 2015
iMac 2.5Ghz i5 2011 (Mavericks 10.9)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad