about

bley is an intelligent greylisting daemon for Postfix. It uses various tests (incl. RBL and SPF) to decide whether a sender should be greylisted or not, thus mostly eliminating the usual greylisting delay while still filtering most of the spam.

bley was developed during my bachelor's thesis at the Heinrich-Heine-University Duesseldorf (PDF XML BibTeX) and now continues to grow as my time permits.