Cisco Cisco Email Security Appliance C680 User Guide
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Cisco AsyncOS 8.5 for Email User Guide
Chapter 25 FIPS Management
Managing Keys for DKIM Signing and Verification
DKIM Verification
The appliance requires a message to use a FIPS-compliant key in order to verify a DKIM signature. If
the signature does not use a FIPS-compliant key, the appliance returns a permanant failure.
the signature does not use a FIPS-compliant key, the appliance returns a permanant failure.