How can I use this header to troubleshoot authentication?
Verification: check that expected authentication passes. If DKIM shows fail, investigate signing configuration. If SPF shows fail, verify sending IP is in SPF record. DMARC fail indicates alignment issues.
Failure analysis: header details explain failures. "DKIM signature mismatch" suggests message modification. "SPF fail (ip not permitted)" shows unauthorized sending IP. Specific information guides troubleshooting.
Comparison: check headers on both delivered and filtered messages. Understanding what passes versus fails reveals patterns. Consistent authentication on delivered messages confirms proper configuration.
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