Rspamd is an open-source software distributed under the terms of permissive Apache license. To contribute to rspamd you might want to go to the GitHub project page, study the current issues and suggest solutions.
Here is a short summary of these ideas.
Many rspamd modules are undocumented. We would appreciate any help in documenting them in markdown format for this site.
The original Lua bindings are too complicated at the moment. The idea is to unify its arguments by using indexed tables and to use FFI bindings for calling of C code.
Currently, we support plain memory-mapped files only for storing statistics tokens. However, we’d like to support other backends, such as redis, sqlite or other storages.
So far, rspamd works with libevent only, however, supporting of other event reactors, such as libev, libuv or picoevent would be interesting.
For some checks, it is good to check geographical location of the sender. Rspamd now supports radix tries and it is possible to write geoip plugin completely in lua therefore.
Currently, rspamd allows to turn on and turn off debugging logs globally. Ideally, we would like to have a fine-grained set of modules to enable or disable debugging. Moreover, many places in rspamd code lack debugging support, which is a problem when dealing with bugs.
The never-ending task of writing new rules is here. Spam fighting is a continuous process, so we need help from mail administrators who want to contribute their useful rules.
With introducing of lua-functional we want to improve the style and safety of the existing lua plugins.