Yesterday, I got the update with mmsd-tng. I sent some group texts to my friends asking them to respond, but they haven’t responded yet. I’m using the MMS settings that I found here. I have read receipts turned on, so when I send an SMS, I see either a gray checkmark or a red X, depending on whether my message went through. I don’t see those on my group texts.
What else do I need to do to get this working?