The security or policy status codes report failures involving policies such as per-recipient or per-host filtering and cryptographic operations. Security and policy status issues are assumed to be under the control of either or both the sender and recipient. Both the sender and recipient must permit the exchange of messages and arrange the exchange of necessary keys and certificates for cryptographic operations.
- x.7.0
- Other or undefined security status
- x.7.1
- Delivery not authorized, message refused
- x.7.2
- Mailing list expansion prohibited
- x.7.3
- Security conversion required but not possible
- x.7.4
- Security features not supported
- x.7.5
- Cryptographic failure
- x.7.6
- Cryptographic algorithm not supported
- x.7.7
- Message integrity failure
- x.7.8
- Trust relationship required Source
- x.7.16
- Future release per-user message quota exceeded Source
- x.7.17
- Future release system message quota exceeded Source