RFC 5530 · PROPOSED STANDARD · 2009
SUN · 14 JUN 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.
Other RFCs from 2009
- RFC 5529 Modes of Operation for Camellia for Use with IPsec
- RFC 5531 RPC: Remote Procedure Call Protocol Specification Version 2
- RFC 5528 Camellia Counter Mode and Camellia Counter with CBC-MAC Mode Algorithms
- RFC 5532 Network File System Remote Direct Memory Access Problem Statement
- RFC 5527 Combined User and Infrastructure ENUM in the e164.arpa Tree
- RFC 5533 Shim6: Level 3 Multihoming Shim Protocol for IPv6
- RFC 5526 The E.164 to Uniform Resource Identifiers Dynamic Delegation Discovery System Application for Infrastructure ENUM
- RFC 5534 Failure Detection and Locator Pair Exploration Protocol for IPv6 Multihoming