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NORS -- CSRIC Best Practices Result

CSRIC Best Practices Result

Detailed Information for the Best Practice: 9-8-8907

Number 9-8-8907
Priority Critical
Description Immediately Reject Undeliverable Email:
ISPs should configure their gateway mail servers to immediately reject undeliverable email, rather than accepting it and generating non-delivery notices (NDNs) later, in order to avoid sending NDNs to forged addresses.
Network Type(s) Internet/Data
Industry Role(s) Service Provider
Keyword(s) Cyber Security;Intrusion Detection;Network Design;
Reference/Comments By rejecting undeliverable email, the gateway mail will inform the sending mail server, which can apply local policy regarding whether or not to notify the message sender of the non-delivery of the original message.
See the following document for more information:

Note that the Best Practices in this grouping are primarily aimed at ISPs that provide service to consumer end-users on residential broadband networks, but may be applicable to other users and networks as well.