That’s a good question. I am not sure if they have a universal discipline. I know that the Copts only allow divorce with the possibility of remarriage in cases of adultery, and then only for the innocent party. Perhaps someone else has more information... ?
I’m thinking there are probably a limited number of remarriages allowed but only in the case of divorce, but I’m not finding specifics. I found one place that said Oriental Orthodox also allow it for apostasy, but not how many times it is actually allowed.
Freegards