I've heard 2 months and I've heard 3 months. Half our wedding is OOT and the OOT guests wil receive StDs. We are trying to keep numbers reasonable (horrible to say but we want a certain number of no's) so we thought doing it at the 2 month mark may keep it to people who really want to be there but don't want to cut it too short either. What's your goal mail date and your wedding date?