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Duplicate Extension Relevant specifications ======================= doc/rfc/duplicate.rfc7352.txt Description =========== The "duplicate" extension adds a new test command called "duplicate" to the Sieve language. This test adds the ability to detect duplications. The main application for this new test is handling duplicate deliveries commonly caused by mailing list subscriptions or redirected mail addresses. The detection is normally performed by matching the message ID to an internal list of message IDs from previously delivered messages. For more complex applications, the "duplicate" test can also use the content of a specific header field or other parts of the message. Refer to doc/rfc/duplicate.rfc7352.txt for a specification of the Sieve language extension. Previously, this extension was Dovecot-specific and available under the name "vnd.dovecot.duplicate". That implementation differs significantly from what is now published as an RFC, but for backwards compatibility the original extension is still supported. Configuration ============= The "duplicate" extension is available by default. The "duplicate" extension has its own specific settings. The following settings are available (default values are indicated): sieve_duplicate_default_period = 14d sieve_duplicate_max_period = 7d These options respectively specify the default and the maximum value for the period after which tracked values are purged from the duplicate tracking database. The period is specified in s(econds), unless followed by a d(ay), h(our) or m(inute) specifier character. Example ======= plugin { sieve = ~/.dovecot.sieve sieve_duplicate_default_period = 1h sieve_duplicate_max_period = 1d }