I am utilizing Microsoft OneNote version 15.2.2 on a Mac. Is it possible to share sections from the notebook via email as an attachment that can be edited, instead of only in the body of the email?
Unfortunately, no. OneNote for Mac does not support local files in any fashion, including saving them. You are expected to use OneDrive and SharePoint instead. Your best bet would be to use File | Share | Email Page | As Message and paste the body into a TextEdit Document.