JunkMatcher is a cocktail-styled spam filter for Mail.app on Mac OS X (10.3.x or later). It filters spam by conducting a wealth of tests over emails. Two types of tests are available: property tests can detect general characteristics of spam using techniques such as naive Bayesian filtering (thanks to SpamBayes) and blacklist lookup (checking if a message was sent from a spamming IP address), and pattern tests can spot keywords such as "v1ägra" or "\/Iagr á" by using patterns written in regular expressions, a very powerful language designed just for that - to describe patterns.