greyd is a
transparent Greylist proxy for the purpose of rejecting spam send by
spambot armies. The first generation of code which has been running in
production for about 3 months has greatly reduced the amount of spam
that needs to be processed by conventional anti-spam techniques.
project was taken on a moderate amount of research was conducted to
find an existing package that could meet the needs of proxying mail for
unconventional SMTP servers (such as zmailer). Principally two packages were identified.
One was based on an old library that has not been maintained for 6
years, generally hard to find and would not compile under current Linux
OSes without a lot of work. The other required many dependent packages
which was beyond the scope of implementing a simple solution.
greyd is written entirely in Python and only requires that the Twisted
framework be installed. Since Twisted is a pure Python framework it is
virtually impossible to have installation problems if a valid
installation of Python is available. This project is a simple design
that can be used nearly on any OS (in theory even Windows platforms or
with very little porting efforts) and will work with any SMTP server
without having to modify the SMTP configurations as most Greylist