Defines the MOVE command for atomically moving messages between IMAP folders without a COPY+EXPUNGE sequence.

Ties SPF and DKIM together into a single policy record that instructs receivers how to handle failing messages.

Defines the List-Unsubscribe-Post header enabling one-click unsubscribe, required by Google and Yahoo bulk sender rules since Feb 2024.

Defines List-Unsubscribe, List-Help, List-Post and other headers for automating mailing list management.

Defines the List-Id header for uniquely identifying mailing lists, used by email clients to organise list mail.

Framework RFC for EAI (Email Address Internationalization) supporting Unicode email addresses and headers.

Defines the SMTPUTF8 SMTP extension that allows UTF-8 in MAIL FROM, RCPT TO, and headers.

Defines UTF-8 encoded headers for internationalized email messages.

Defines how international domain names are encoded for use in DNS and email addresses.

Practical guide for validating email addresses, URLs, and domain names in applications.