What tools are there to protect against email phishing attacks?

Today email inboxes across the internet received an imitated Google Docs email designed to hijack Google accounts. Are there tools to help flag these potential threats?
Ryan HooverFounder, Product Hunt · Asked
Jesse MiddletonVC @Flybridge. Co-founder @WeWorkLabs. · Written
Protects your domains from inbound phishing attacks and from others using your domains to phish others.
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