Sortah provides a simple, declarative internal DSL for sorting
your email. It provides an executable which may serve as an external
mail delivery agent for such programs as `getmail`. Finally, since
your sorting logic is just Plain Old Ruby Code (PORC, as I like to call it).
You have access to 100% of ruby as needed, including all of it's
object oriented goodness, it's wonderful community of gems, and it's
powerful metaprogramming ability.