sender_dependent_relayhost_maps Syntax

[awingnut]

I have a series of user names that need to be relayed through a server
other then the default. It is not clear from the documentation if wild
cards are allowed but it appears they are not. If that is true then I
need to list each one individually. However, I am also using generic
mapping and again it is not explained in the documentation which address
needs to be in the relay maps file, the local address vs. the translated
address. Can some please clarify? Thanks.