Disabling Mark as Read Automatically

By default, Mailbird will mark each email that you click as read. If you don't want this to happened you can set it up in Mailbird settings

You can change this to never, or you can set a time delay (from 1 to 60 minutes) until Mailbird mark them as read. Remember, if you set the time delay to 5 minutes, that means you need to keep opening that message for 5 minute so that Mailbird can mark them as read.