I'm co-founder at Missive (https://missiveapp.com https://missiveapp.com), although not 100% similar Missive will let you collaborate not only on shared inboxes

I'm co-founder at Missive (https://missiveapp.com https://missiveapp.com), although not 100% similar Missive will let you collaborate not only on shared inboxes but also on emails received at personal business email addresses. Imagine if Gmail had a baby with Slack... well it would be Missive. If you're interested, read this blog post about cool use cases: https://missiveapp.com/blog/missives-10x-use-cases https://missiveapp.com/blog/missives-10x-use-cases + check out some of our newly released features: https://missiveapp.com/blog/new-features-tasks https://missiveapp.com/blog/new-features-tasks Good luck with your search! :)