RFC 5530 · PROPOSED STANDARD · 2009
THU · 30 JUL 2026
IMAP Response Codes
Overview
RFC 5530, “IMAP Response Codes”, is a Proposed Standard document published in May 2009 by A. Gulbrandsen. The canonical text is published by the RFC Editor.
Abstract
IMAP responses consist of a response type (OK, NO, BAD), an optional machine-readable response code, and a human-readable text.
This document collects and documents a variety of machine-readable response codes, for better interoperation and error reporting. [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 5530 is hosted at rfc-editor.org. Available in TXT,HTML.
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