Local delivery agent, uses Sieve to specify filter rules

Like Bloom filters, these structures achieve a small space overhead by accepting a small probability of false positives. In the case of "Bloomier filters", a false positive is defined as returning a result when the key is not in the map. The map will neve

MVMF is a package containing a growing number of utilities used in handling email. Some of these utilities make use of mvmf's scripting language, MFL, which combines an implementation of the Sieve filtering language and a C-like language in a powerful way