A Registry for SMTP Enhanced Mail System Status Codes
RFC 5248, “A Registry for SMTP Enhanced Mail System Status Codes”, is a Best Current Practice document published in June 2008 by T. Hansen, J. Klensin. It updates RFC 3463, RFC 4468, RFC 4954. The canonical text is published by the RFC Editor.
Abstract
The specification for enhanced mail system status codes, RFC 3463, establishes a new code model and lists a collection of status codes. While it anticipated that more codes would be added over time, it did not provide an explicit mechanism for registering and tracking those codes. This document specifies an IANA registry for mail system enhanced status codes, and initializes that registry with the codes so far established in published standards-track documents, as well as other codes that have become established in the industry. This document specifies an Internet Best Current Practices for the Internet Community, and requests discussion and suggestions for improvements.
What “Best Current Practice” means
Documents the IETF community's recommended operational or procedural practice rather than a protocol specification.
The canonical text of RFC 5248 is hosted at rfc-editor.org. Available in TXT,HTML.
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