Whenever possible, try to eliminate email from the equation by using virtual collaboration platforms like Google Drive or iCloud. It’s an excellent way to cut down on the endless threads and email meant for someone else when you’re working on a group project.
There are also some really handy email management apps that make life much easier. A lot of them do basically the same thing so you can find one an interface and features that work best for you Dispatch and Mailbox and Gmail’s Inbox all make it easy to organize and respond to email on the go.