My Fiance and I went with a seal and send invitation. It is convenient for our guest cause all the guest have to do is tear off the bottom portion which is like and post card and send it out. That bottom portion is the response. I did not have problems of invitations getting to the guest but its getting the response. I have had guest that say they already mail it out and I have not received their responses. I also had guest say the mailman wouldn't take it. Did anyone have the same problem?