Option to send email along with messenger notification

Currently, it appears that email notifications will only be sent to a customer if they are not active within the messenger app for for 3 minutes since the reply was sent. If a customer has this tab open, but maybe is in another area and forgets that it was left open, then an email is never sent out. I do not see any options to toggle for a user or within Intercom generally to enable emails to be sent in conjunction with an active session in messenger. I believe this might add value to customers so they can track some of this via email and if they happen to forget they left the tab open then an email is also sent so they get notified of any communication. If this was something that could be enabled in a user’s preferences I think that would be ideal so they can control how they want to receive communication.