Sieve copy extension

The MTA supports the Sieve copy extension specified in RFC 3894 (Sieve Extension: Copying Without Side Effects), which adds a  parameter to the Sieve   and    actions allowing these actions to be used without cancelling the default save-to-inbox Sieve effect. The capability name is " ": require "copy"; redirect :copy "another-mailbox@domain.com";
 * 1) A copy of the message will still be retained/delivered "normally"

See also:
 * Sieve fileinto action
 * Sieve redirect action
 * Sieve supported extensions
 * Sieve language