The key with unread emails is that I did end with 0. I did that by marking all the emails as read that I forwarded off to my new backups. I think I only sent ~20 to them though.
It might seem bad that I sent about 50 to my new backups but compared to what I did have and how I got over 50 emails on my last day alone, I think it wasn't that bad at all. I spent a lot of extra hours. The night before my last day of work I spent 2 hours at home doing more emails and handling the stuff so I didn't have to pass it over. I also think it's good I forwarded things instead of just dropping them and leaving work.
Have you ever left a job? How did you handle your emails or your other work in progress?