RFC 4952: Overview and Framework for Internationalized Email

Full use of electronic mail throughout the world requires that people be able to use their own names, written correctly in their own languages and scripts, as…

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Incoming relationships (7 related RFCs)

Updated by — RFC 5336: SMTP Extension for Internationalized Email Addresses
Obsoleted by, Informatively referenced by — RFC 6530: Overview and Framework for Internationalized Email
Normatively referenced by — RFC 5825: Displaying Downgraded Messages for Email Address Internationalization
Normatively referenced by — RFC 5983: Mailing Lists and Internationalized Email Addresses
Informatively referenced by — RFC 5891: Internationalized Domain Names in Applications (IDNA): Protocol
Informatively referenced by — RFC 5721: POP3 Support for UTF-8
Informatively referenced by — RFC 5538: The 'news' and 'nntp' URI Schemes