I have opted to not do a mail-in RSVP (I've been told by several family members married in recent years that they didn't get many of them back and I hate the idea of putting postage on all of those cards for it to be wasted). We are giving folks the option to RSVP on our website, by an email address we created for the wedding, and they can call or text by cell. Should we put the RSVP info on a separate card in the envelope, or print the info on the back of the card? We are trying to be frugal, however, I worry many people will not read the whole card, front and back.