When you send a message through Symantec Hosted Mail Security using Transport Layer Security (TLS), you receive a Non-Delivery Report (NDR) or mail server log entry that contains the error "403 4.7.0 Authentication failed".
Security certificate on Hosted server possibly expired, or certificate from sender expired.
To troubleshoot this issue, please collect:
Example NDR's with intact headers and related mail server log entries which are no older than five (5) calendar days.
The certificate file used for this TLS communication.
Contact Symantec Technical Support for additional assistance.
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