IMAP Support for UTF-8
RFC 9755, “IMAP Support for UTF-8”, is a Proposed Standard document published in March 2025 by P. Resnick, J. Yao, A. Gulbrandsen. It obsoletes RFC 6855. The canonical text is published by the RFC Editor.
Abstract
This specification extends the Internet Message Access Protocol, specifically IMAP4rev1 (RFC 3501), to support UTF-8 encoded international characters in user names, mail addresses, and message headers. This specification replaces RFC 6855. This specification does not extend IMAP4rev2 (RFC 9051), since that protocol includes everything in this extension.
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 9755 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 9754 Extensions for Opening and Delegating Files in NFSv4.2
- RFC 9756 Update to the IANA Path Communication Element Protocol Numbers Registration Procedures and the Allowance of Experimental Error Codes
- RFC 9753 Extension for Stateful PCE to Allow Optional Processing of Path Computation Element Communication Protocol Objects
- RFC 9757 Path Computation Element Communication Protocol Extensions for Native IP Networks
- RFC 9752 Conveying Vendor-Specific Information in the Path Computation Element Communication Protocol Extensions for Stateful PCE
- RFC 9758 Updates to the 'ipn' URI Scheme
- RFC 9751 Closing the RTP Payload Format Media Types Registry
- RFC 9759 Unified Time Scaling for Temporal Coordination Frameworks