We would like to suggest these two features for the HubSpot Inbox
a) Forward
b) Reply all
I found another forum post for the forward feature https://community.hubspot.com/t5/HubSpot-Ideas/Forward-Emails-from-Conversations/idi-p/204078/page/2#comments
But not for the relpy all. This is very helpful considering that some emails are sent to multiple email address like for example a family (husband and wife) or for a company to multiple clients.