Yahoo on Yahoo's new DMARC Policy

What impact has Yahoo's new "p=reject" DMARC policy had on spam claiming to be from "DMARC has reduced spam purported to come from accounts by over 90%," says Alex Stamos, Yahoo's Vice President of Information Security, in his recent testimony before Congress.

H/T: Return Path's Ken Takahashi.

(Note: Alex's title may be Chief Information Security Officer; I've seen him referred to both ways. I decided to use the title referenced in the testimony.)
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