For the last couple of weeks, I've been seeing "Delivery Status Notification (Failure)" from Yahoo's various domains for users who have dot-forward aliases on my server and are spoofing the "from" field of their outgoing emails to match their alias.
550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF xxxx.xxx with ip 209.85.214.178 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information. (The masked domain is the one with the alias. The user sent the message from 209.85.214.178, Gmail.) Identical emails from the same user to Gmail and Comcast reach their recipients just fine. Both indicate that SPF passed, unlike Yahoo. It looks to me as if Yahoo is expecting the "from" field to pass SPF instead of (or in addition to) the envelope sender. Or is there a different issue that I'm not seeing? -- =============================================== Russell Clemings <rclemi...@gmail.com> ===============================================
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