Now that all the other stuff is set up, this is easy. For full details, look in at the man page.
Summary: ((chain)) sends it through 3 remailers. ((chain=<length>)) sends it through <length> remailers. ((chain=(<mix1>;...;<mixn>))) sends it through n mixmaster remailers. The list of mixmaster remailers is in /opt/mixmaster/src/type2.list.
``True anonymity'', more or less, can be achieved by sending an anonymous reply through a mail2news gateway.