#### 5.2.2 Actions Described ¶

An action is a Sieve command that performs some operation over a 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 the user to extend this set using loadable actions. See Actions, for detailed discussion of actions.