RFC 6134: Sieve Extension: Externally Stored Lists

The Sieve email filtering language can be used to implement email whitelisting, blacklisting, personal distribution lists, and other sorts of list matching.…

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Incoming relationships (3 related RFCs)

Normatively referenced by — RFC 6133: Sieve Email Filtering: Use of Presence Information with Auto-Responder Functionality
Normatively referenced by — RFC 9671: Sieve Email Filtering: Extension for Processing Calendar Attachments
Informatively referenced by — RFC 6132: Sieve Notification Using Presence Information