Email comments enables people inside your organization to comment on specific emails inside of Gmail. This saves you from switching the conversation to slack or hitting "Reply All" and taking out external parties to have an internal conversation. All without the sorry of accidentally sending an internal conversation to external parties. We automatically generate the permissions so you can start commenting instantly without worrying about adding/removing or tagging people. The rules are simple 1) They are inside your company and 2) They are included in the email (TO or CC).