RFC 5233: Sieve Email Filtering: Subaddress Extension

On email systems that allow for 'subaddressing' or 'detailed addressing' (e.g., "ken+sieve@example.org"), it is sometimes desirable to make comparisons…

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Outgoing relationships (1 related RFC)

Obsoletes — RFC 3598: Sieve Email Filtering -- Subaddress Extension

Incoming relationships (2 related RFCs)

Informatively referenced by — RFC 5784: Sieve Email Filtering: Sieves and Display Directives in XML
Informatively referenced by — RFC 8098: Message Disposition Notification