4.2.2 Actions Described

An action is a Sieve command that performs some operation over the message. Actions do the main job in any Sieve program. Syntactically, an action is a command terminated with semicolon, e.g.:

     keep;
     
     fileinto "mbox";

gnu Sieve provides the full set of actions described in RFC 3028. It also allows to extend this set using loadable actions. See Actions, for detailed discussion of actions.