This project are a Fork of dkimproxy on sourceforge (that has no modification since 2013-02-07)
https://sourceforge.net/projects/dkimproxy/
DKIMproxy is an SMTP-proxy that implements the DKIM and DomainKeys standards, to sign and verify email messages using digital signatures and DNS records. It can be used to add DKIM support to nearly any existing SMTP mail server.