Each time SmarterMail runs it will re-attempt conversion on a previously failed domain. However, unless the underlying issue that caused conversion to fail is corrected, it will likely just fail again. I would submit a support ticket so we can work with you more directly on what could be causing it and that way we can get it fixed. When you submit that ticket, if you could DM me (via community, click on me) your Ticket ID when you do. I wanna make sure you get fixed today.