Answer: absolutely.
People receive court documents and information from clients all the time through email. If those documents only stayed that way, there would be no paper created.
The best way to use email so as to reduce paper is to send court documents to adversaries whenever possible through email, and to make sure to communicate with clients if possible through email. All of the submissions and attachments can then be put in the respective clients' folders, and are thus just as searchable as if you scanned them into PDFs. Of course, not everybody is going to be that technologically progressive, but you do what you can.