Sorry if this has been asked before. We are sending postcard STD's, paper invites, the wedding is semi-formal, suits and all, so not casual in the slightest. We just want to be sure everything is fine and jolly etiquette-wise. My fiancé wants RSVP's to be done online instead of mailed back. Our wedding website is on Appycouple which is pretty smart and easy to use with its rsvp system. I would trust it for this purpose. The older relatives in my family actually love technology for the most part, most have tablets and Facebook. So yay or nay on the online RSVP's? Or traditional mail-in RSVP's for older people, and online for our age-group?