Sieve Extension by RFC

Capability name	Description	RFC number	Status
body	Provides a test for matching against the the body of the message being processed		supported
comparator-*	adds the indicated comparator for use with the :comparator argument		supported
convert	adds a new Sieve test and action that enable Sieve scripts to perform data conversions on the message being delivered.
copy
date	The “date” extension gives Sieve the ability to test date and time values.
duplicate	Adds test ‘duplicate’ that can be used to test whether a particular message is a duplicate, i.e., whether a copy of it was seen before by the delivery agent that is executing the Sieve script.
editheader	Adds actions ‘addheader’ and ‘deleteheader’ that modify the header of the message being processed
enclose	adds the “enclose” action for enclosing a message with a wrapper.
encoded-character	changes the interpretation of strings to allow arbitrary octets and Unicode characters to be represented using US-ASCII
enotify	adds the ‘notify’ action for notifying user about the received message. It also provides two new tests: valid_notify_method checks notification URIs for validity; notify_method_capability can check recipients capabilities.		supported
envelope	adds the ‘envelope’ test for testing the message transport sender and recipient address
envelope-deliverby	The “envelope-deliverby” extension extends the envelope test to allow checking of information associated with the Deliver-By ESMTP extension defined in [RFC2852].
envelope-dsn	The “envelope-dsn” extension extends the envelope test to allow checking of information associated with the DSN ESMTP extension defined in [RFC3461].
environment	The “environment” extension provides a new environment test that can be used to implement scripts that behave differently when moved from one system to another or otherwise operated in different contexts.
ereject	adds the ‘ereject’ action for refusing delivery of a message. The refusal should happen as early as possible (e.g. at the protocol level) and might not preserve the exact reason for refusal if it contains non-US-ASCII text.		supported
extlists	Adds the “:list” match type to certain Sieve tests, and the “:list” argument to the “redirect” action. The “:list” match type changes tests to match values against values stored in one or more externally stored lists. The “:list” argument to the redirect action changes the redirect action to forward the message to email addresses stored in the externally stored list.
extracttext	adds the “extracttext” action for extracting text from a MIME body part.
fcc	Adds the “:fcc” parameter to Sieve action commands that generate additional messages.
fileinto	adds the ‘fileinto’ action for delivering to a mailbox other than the default		supported
foreverypart	adds the “foreverypart” and “break” actions for iterating through MIME parts of a message.
ihave	The “ihave” extension provides a means to write scripts that make use of other extensions only when they are actually available.		supported
imap4flags	Adds actions and tests for manipulating IMAP flags		partial
imapsieve	Add Sieve processing for IMAP events.
include	adds the “include” command to execute other Sieve scripts, the “return” action from an included script, and the “global” command and “global” variables namespace to access variables shared among included scripts.
index	The “index” extension provides a means to limit header and address tests to specific instances when more than one field of a given type is present.
mailbox	adds test for checking for mailbox existence and a new optional argument to fileinto for creating a mailbox before attempting mail delivery.
mboxmetadata	adds tests for checking for mailbox metadata item existence and for retrieving of a mailbox metadata value.
mime	adds the “:mime” and “:anychild” tagged arguments to the “header”, “address”, and “exists” tests. Adds the “:type”, “:subtype”, “:contenttype”, and “:param” options when “:mime” is used with the “header” test.
redirect-deliverby	The “redirect-deliverby” extension extends the redirect action to allow specification of the BY ESMTP parameter associated with the Deliver-By SMTP extension defined in [RFC2852].
redirect-dsn	The “redirect-dsn” extension extends the redirect action to allow specification of the NOTIFY and RET ESMTP parameters associated with the DSN SMTP extension defined in [RFC3461].
regex			supported
reject	adds the “reject” action for refusing delivery of a message. The exact reason for refusal is conveyed back to the client.		supported
relational	Extends existing conditional tests in Sieve language to allow relational operators
replace	adds the “replace” action for replacing a MIME body part of a message.
servermetadata	adds tests for checking for server metadata item existence and for retrieving of a server metadata value.
spamtest	Provides a test to check for varying likelihood of an email message being spam.
spamtestplus	Provides a test to check for varying likelihood of an email message being spam, possibly using a percentage range.
special-use	adds a test for checking whether an IMAP special-use attribute is assigned for a particular mailbox or any mailbox, and it adds the ability to file messages into a mailbox identified solely by a special-use attribute.
subaddress	adds the ‘:user’ and ‘:detail’ address parts for use with the address and envelope tests
vacation	adds an action for generating an auto-reply saying that the original message will not be read or answered immediately
vacation-seconds	adds the “:seconds” parameter to the Sieve Vacation extension. Implementations that support this MUST also support “vacation”.
variables	Adds support for variables to the Sieve filtering language.		supported
virustest	Provides a test to check for varying likelihood of there being malicious content in an email message.