A really good technote:
Knowledge Collection: Lotus Notes and Domino mail rules
http://www-1.ibm.com/support/docview.wss?rs=463&uid=swg27012234
This Knowledge Collection serves as a source of key documents regarding Lotus Notes® and Domino® mail rules. This includes Block Sender rules, Server mail rules, and Domino Web Access mail rules.
Server mail rules
Notes mail rules
Domino Web Access mail rules
Block Sender rules
Additional mail rule references
JYR