stop blocking gmail
Started within last 24 hours: can't receive message from gmail senders. Gmail sender sees block message:
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.
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CHRISTOPHER HEBARD
shared this idea
Hi there. Please inform these senders to further investigate this issue from their end (they might need to configure DKIM for their domain) and if they cannot find the root cause on their end, they need to contact our team at: https://senders.yahooinc.com/contact/