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What should I do

Fix 550 5.7.27

Make SPF pass for the host that sent the message. Gmail's bulk-sender rule on this bounce is SPF, not SPF or DKIM.

  • Publish one v=spf1 record that names that host. Two such records on the same name are a permerror.
  • If evaluation already exceeds 10 DNS-querying terms, that is also a fail to interpret, and Gmail will not see a pass.