Missive co-founder here (<a href="https:&#x2F;&#x2F;missiveapp.com" rel="nofollow">https:&#x2F;&#x2F;missiveapp.com</a>). We built the app for a similar purpose: a way to share and comment around the heavy email load we get as a team.<p>Missive is designed to work with any email setup, not just shared inboxes. Our help@ and sales@ addresses just forward emails to our personal inboxes. This way each person keeps control of their own inbox, while being able to comment within threads and see who’s replying in realtime thanks to Missive.<p>Would love to have your thoughts. Feel free to ping me on Twitter @rafbm or rafael@missiveapp.com