"Return Receipt" doesn't work with all email. Like if I email from my Outlook account to one of my webmail accounts, it doesn't work. Just so you know.
Also, I am guilty of not RSVPing to not one, but two birthday parties this month. I saw them last night (after the event dates), stuck to the fridge. In my defense, I didn't know they had arrived. DH stuck them up there and didn't tell me about them. Things do happen sometimes, and I try to imagine the person that doesn't RSVP is at least as disorganized & overwhelmed as I am. Also, I don't check my personal email every day. I forget. So, evites often go undiscovered for a few days in my case. It's not a case of being intentionally rude. It's a case of being constantly 3 days behind on everything. Sorry.
As the arc of history bends towards justice, it's a new, more progressive day. --Steve Benen, The Maddow Blog, 11-07-12