2 recommended

2
Unibox

People-centric email client

Philip AmourFreelance Product Designer · Written
It looks like this is what you're exactly looking for - used to use it for a while and really enjoyed it.
Comments (1)Tweet
2
Hop

Turns email into a chat interface

Alexandre MouriecAssociate @ Argos VR | Writer @ Stuffi · Written
I think Hop might be what you want 😉
Comments (1)Tweet