Answering emails has become a growing part of my daily routine, and I've been looking for ways to cut back. A support forum felt like the obvious answer, but I didn't want to force people to signup for forum accounts, and it would be nice if private account issues could be handled in the same place as public UI questions.
I recently discovered Tender (tenderapp.com, not to be confused with the food-dating tender smartphone app), and it looks like a good fit. Forum-based discussions that anyone can chime in on, email integration, and the ability to set conversations as either public or private.
There's now a new help and support site up at help.caltopo.com, with a discussion forum and soon-to-be-expanded knowledge base. Once the kinks are worked out, I'll start routing emails there as well, so that I can make useful conversations public.