opensiqserver is a Server software that implements the SIQ protocol for scoring based on facts or reputation of an IP/domain pair. It can be used as a base for antispam server-side solutions working for example with sendmail and milter-siq or any other SIQ client.
opensiqserver is the first sender reputation system standard, open source and free.
These details are provided for information only. No information here is legal advice and should not be used as such.