RFC 5504: Downgrading Mechanism for Email Address Internationalization

Traditional mail systems handle only ASCII characters in SMTP envelope and mail header fields. The Email Address Internationalization (UTF8SMTP) extension…

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Incoming relationships (4 related RFCs)

Obsoleted by, Informatively referenced by — RFC 6530: Overview and Framework for Internationalized Email
Informatively referenced by — RFC 6857: Post-Delivery Message Downgrading for Internationalized Email Messages
Informatively referenced by — RFC 5721: POP3 Support for UTF-8
Informatively referenced by — RFC 5983: Mailing Lists and Internationalized Email Addresses