Mapping Rules
A profile can be mapped to multiple projects, using Project Mappings as previously described. If there is more than one project mapped then you can use rules to direct the emails to the correct project. Currently there are four rule types, Script Rule, Group Rule, Domain Rule and Keyword Rule.
If there is only one project mapped, then you will not be able to add a new rule, because the default settings will always apply.
For more info about using each rule see: