So my friend is getting married in a few weeks, I got my invite, and well, the damn RSVP had no postage. So I call her and tell her since there is no stamp consider this phone call my RSVP. She insists that I MUST send the RSVP via mail. So now I have to take time out of my day, find a damn post office to buy a single stamp. I plan on including stamps with my invites. Have any of you NOT included stamps with your invites? If not, why? Isn't it rude not to?