If it’s implemented, then please make it optional. Just imagine the fun a wannabe rhetorician would have with it:
@Immanuel_kant, 15 minutes ago I refuted your Critique of Pure Reason in it’s entirety. You should unsub from the list if you’re unable to defend your thesis.
Best regards
F. Nietzsche
As a moderator it would be useful to be able to check if a particular user has read a particular post, but that knowledge would need to be handled with some discretion:
@armadillo, you claim to have read all the user guides and are still unable to upload images. The fact is you haven’t read any guides at all. And by the way, I also noticed that you haven’t replied to any of the 9 Private messages which @Coelacanth sent you.
How would you handle users who only use emails? A message or digest which went out and didn’t bounce doesn’t mean that the user has seen it.