Sieve setenvelopefrom extension

New in MS 8.0, the MTA supports a private " " action in system level Sieve scripts. This nonstandard extension is available without any special capability declaration; no " " action is needed for its use. " " accepts a single string argument specifying the new envelope From address.

For other Sieve actions especially relevant to notification messages, see also the Sieve  " " and " " extensions.

See also:
 * Sieve hierarchy
 * Sieve setnotify and setreturn extensions
 * Sieve supported extensions