The LIMITS SMTP Service Extension
RFC 9422, “The LIMITS SMTP Service Extension”, is a Proposed Standard document published in February 2024 by N. Freed, J. Klensin. The canonical text is published by the RFC Editor.
Abstract
This document defines a LIMITS extension for the Simple Mail Transfer Protocol (SMTP), including submission, as well as the Local Mail Transfer Protocol (LMTP). It also defines an associated limit registry. The extension provides the means for an SMTP, submission, or LMTP server to inform the client of limits the server intends to apply to the protocol during the current session. The client is then able to adapt its behavior in order to conform to those limits.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9422 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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- RFC 9490 Report from the IAB Workshop on Management Techniques in Encrypted Networks
- RFC 9499 DNS Terminology
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