This is a complete standalone C implementation of the SRS (Sender
Rewriting Scheme) and includes a command line utility and daemon,
test utility and static and dynamic libraries. SRS is a stop-gap
for users of SPF (Sender Policy Framework).

See https://github.com/Exim/exim/wiki/SRS for integration with exim.

WWW: http://opsec.eu/src/srs/