Hi, not currently, but it could be done through some eventing in an update coming soon. The update will add the option to "unsend" mail so you could event if email box 1, send the mails they should have for that email and unsend all the others, if email box 2 send the mails they should have for that email and unsend all the others. I can add a way to choose which letters to show in the scene in a future update.