Post-Delivery Message Downgrading for Internationalized Email Messages
RFC 6857, “Post-Delivery Message Downgrading for Internationalized Email Messages”, is a Proposed Standard document published in March 2013 by K. Fujiwara. The canonical text is published by the RFC Editor.
Abstract
The Email Address Internationalization (SMTPUTF8) extension to SMTP allows Unicode characters encoded in UTF-8 and outside the ASCII repertoire in mail header fields. Upgraded POP and IMAP servers support internationalized messages. If a POP or IMAP client does not support Email Address Internationalization, a POP or IMAP server cannot deliver internationalized messages to the client and cannot remove the message. To avoid that situation, this document describes a mechanism for converting internationalized messages into the traditional message format. As part of the conversion process, message elements that require internationalized treatment are recoded or removed, and receivers are able to recognize that they received messages containing such elements, even if they cannot process the internationalized elements.
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 6857 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 6856 Post Office Protocol Version 3 Support for UTF-8
- RFC 6858 Simplified POP and IMAP Downgrading for Internationalized Email
- RFC 6855 IMAP Support for UTF-8
- RFC 6859 Update to RFC 3777 to Clarify Nominating Committee Eligibility of IETF Leadership
- RFC 6854 Update to Internet Message Format to Allow Group Syntax in the "From:" and "Sender:" Header Fields
- RFC 6860 Hiding Transit-Only Networks in OSPF
- RFC 6853 DHCPv6 Redundancy Deployment Considerations
- RFC 6861 The "create-form" and "edit-form" Link Relations