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Mark emails as read or unread in Mail on Mac
Email messages you haven’t read yet have a blue dot or star (for messages from VIPs) next to them. When you select a message to read it, the dot or star disappears. If you want, you can manually mark messages as read or unread.
- Go to the Mail app  on your Mac. on your Mac.
- Do any of the following: - Mark one message in the message list: Select the message, swipe right with two fingers on your trackpad or Magic Mouse, then click Unread or Read. 
- Mark multiple messages in the message list: Select one or more messages, then choose Message > Mark as Unread or Message > Mark as Read. 
- Mark all unread messages in a mailbox as read: Control-click the mailbox in the Mail sidebar, then choose Mark All Messages As Read.