Yahoo email anti-spoofing policy breaks mailing lists

In an attempt to block email spoofing attacks on yahoo.com addresses, Yahoo began imposing a stricter email validation policy that unfortunately breaks the usual workflow on legitimate mailing lists. The problem is a new DMARC (Domain-based Message Authentication, Reporting and Conformance) "reject" policy advertised by Yahoo to third-party email servers, said John Levine, a long-time email ...



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