ocaml-dkim is a pure implementation of DKIM in OCaml. It permits to verify and
sign an incoming email. It can be use as a SMTP filter service (verify) or as a
SMTP submission service (sign).
How to install it?
You must have an OPAM environment. Then,
ocaml-dkim can be installed with:
$ opam pin add https://github.com/dinosaure/ocaml-dkim.git
How to use it?
ocaml-dkim provides 2 binaries, one to verify, the second to sign an email.
$ dkim.verify test/raw/001.mail [ok]: sendgrid.info [ok]: github.com
It shows all domains which signed the given email and whether the signature is
correct or not (for the last case, it shows you the selector).
able to sign an email from a private RSA key and a specific domain such as:
$ dkim.sign -k private-key.pem --selector admin --hostname x25519.net test/raw/001.mail DKIM-Signature: ... Rest of the email
It prints the signed email then. The user is able to use a specific RSA private
key or it can use a seed used to generate the RSA private key with the fortuna
random number generator.
ocaml-dkim has received funding from the Next Generation Internet Initiative
(NGI) within the framework of the DAPSI Project.