When I initially followed- up on RSVPs, I found out a friend of mine moved before the invitation was sent his way, and he never received it. No big deal, I sent a 2nd invitation to his new address. I followed up on this 1.5-2 weeks later, and he said he'd "check his mailbox later." Okay. Now I'm getting annoyed and I don't want that to come across in my tone, but kind of feel like giving an ultimatum is needed here. As in - "if your rsvp isn't received by x date, we will assume you have declined our invitation." Is that completely out of line, nasty, bridezilla behavior? Is there a better way to go about this? I just can't imagine making someone send me 2 invitations and not giving a response!! Please help me sound like the polite & gracious host I know I am deep down inside...