Add "unread" as a search option for smart folders
"Unread" isn't a search option, so we can't integrate it into a smart folder. This is valuable, for example, to set a workflow where i can find unread or starred items to a particular address. I use this in Apple Mail instead of my inbox and thus I see all new messages, or ones I've flagged for later.

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Tim commented
I need this too
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Henk commented
is:unread => 0 mails returned
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Gonzalo commented
Hello this is a flag from Gmail... and its really easy... just create an Smart Folder with this "is:unread" and done...
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Anonymous commented
Yes, I have depended on the Unread smart folder in Apple Mail for years. I try to usr Airmail, but keep going back to Apple Mail for this feature.