Sieve setnotify and setreturn extensions

Introduced in Messaging Server 7.0u1, and available in system Sieves  only, are the nonstandard Sieve actions " " and " ". " " specifies a new value for the DSN NOTIFY parameter and " " specifies a new value for the DSN RET parameter. Both of these parameters are specified in RFC 3461, as are the possible values that can specified for each one.

The primary use of these actions is expected to be to adjust return policies for suspected spam. For example, if address validation cannot be performed, it may be prudent to disable nondelivery reports, return of content, or both for messages suspected of being spam: setnotify "NEVER"; setreturn "HDRS"; For another Sieve action relevant to notification messages, see also the (new in MS 8.0) " "  action which, by overriding a message&#x27;s envelope From address, alters who will be informed if and when a notification message is later generated.

See also:
 * Notification messages
 * Sieve hierarchy
 * Sieve setenvelopefrom extension
 * Sieve supported extensions
 * Sieve filters