I would love to see support for private group emails. Currently if a group email is sent in missive to org members (and possibly a wider group), each missive org member can see all comments and responses (and drafts) from other org members (and the wider group). Most the time this is fine. However in larger groups this is not always the desired outcome. Sometimes I'd like to send a group email to all team members, but keep the responses private so that the team members can't see each others responses. I'd also like to have the option to restrict messaging in these emails for the same reasons.