"Collaborative email on top of G Suite. The main thing we pay for is a comment box below each email thread. It allows us to quickly discuss emails without forwarding or copy/pasting in Slack. It also allows us to edit drafts collaboratively and have multiple team inboxes for invoices, support, and other stuff."

Thanks for the mention Francesco. I'm Philippe, one of the co-founders of Missive [1], don't hesitate if you have any questions.

p.s. We are a tiny team (4) too and use many SaaS ourselves.

[1] https://missiveapp.com/