Any ideas on quickly filing emails into a massive folder structure?



I've joined a small company that deals with a lot of properties. There are various agencies and team members using a massive amount of emails on multiple subjects, but all relevant to any one of the properties. Currently we hold emails from a team member in their folder. We often don't have to do anything with them but hold them for company records.

What would make a lot more sense to me is to have a folder for each property, but I can't figure out a way of doing this practically. Right now if we get an email from Steve, we click the Steve button in the quick steps area and boom, it's gone. That's great, but when it comes to finding an email and we don't know who sent it, it's a proper pain.