RFC 2034 · PROPOSED STANDARD · 1996
SUN · 14 JUN 2026
SMTP Service Extension for Returning Enhanced Error Codes
Overview
RFC 2034, “SMTP Service Extension for Returning Enhanced Error Codes”, is a Proposed Standard document published in October 1996 by N. Freed. The canonical text is published by the RFC Editor.
Abstract
This memo defines an extension to the SMTP service [RFC-821, RFC-1869] whereby an SMTP server augments its responses with the enhanced mail system status codes defined in RFC 1893. [STANDARDS-TRACK]
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.
Read this RFC
The canonical text of RFC 2034 is hosted at rfc-editor.org. Available in TXT,HTML.
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