I'm sorry, Jeffery, but I don't understand your question.
An email "forwarder" is a program that forwards emails.
Do you want a list of all the email forwarding programs you can use? If so, I'd suggest using Google.
Or do you mean you want a list of all the emails forwarded from your server to other locations?
I'm not sure if that's doable or not; I'd start by reading the documentation at http://www.exim.org/ and then perhaps joining the exim-users list, and ask them for any details missing or that you don't understand.
Note that once you change exim.conf you'll have to maintain it yourself.