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Email spoofing is one of the top attack vectors against businesses. These five protocols form a complete defense stack.
"Inbox Shield showed us that three of our sending subdomains had no DMARC — including our Mailchimp domain. That would have been bad."
"We went from p=none to p=reject in 6 days. Most DMARC documentation is incomprehensible — Inbox Shield's setup guide actually made sense."
"An employee reported a phishing email 'from our CEO'. Inbox Shield had already flagged the spoofing gap. We fixed it that same day."
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Email authentication is one piece. Here's how to check the rest — all free, no account needed.