Understanding the "read" vs “unread” status
Front's unread messages have a blue dot to the left of the message, and the text is bolded.
Front's read messages get rid of the blue dot, and unbold the subject and body preview. A conversation is marked as read once you've read it. If someone on your team has read it, but you have not, it will still appear as unread in your view.
To mark as unread, hover over the left of the message and select the blue dot on the left.
For individual inboxes set up via IMAP/Gmail, reading a message in Front will mark it as read in Gmail.
For shared inboxes set up via IMAP/Gmail, messages are marked as read in Gmail only when they are assigned to someone in Front.