It’s very easy to lose sight of your important e-mails with so much spam or the high quantity of e-mails. Wouldn’t it be nice 
to separate your unread, new e-mails from the ones you opened already? Yes, there is the default way of spotting new e-mails by bold text; however, they do sometimes get lost if you have to scroll down your screen to find them.
In Mac Mail, you can create an Unread Smart Mailbox to highlight new emails. This mailbox will just pull in all unread e-mails. When you open one, it will then kick it over to your regular mailbox with the rest of the read e-mails.
Here’s you how you can set up your smart mailbox:
- Go to Mailbox -> New Smart Mailbox
- Click drop-down box under contacts text and select message is unread
- Name the smart box: unread e-mail
This smart mailbox creation is a great way to control your Mac Mail while still being e-mail efficient.