More than three-quarters of the world’s email inboxes are secured against spammers and scammers with DMARC — a set of technical protocols designed to prevent the spoofing of email addresses, according to figures released Tuesday. That’s a big rise from fewer than two-thirds in 2015 — growth driven in large part by the adoption of  DMARC by Chinese email and internet providers, according to Dylan Tweney, head of communications at ValiMail, which compiled the figures.

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