Mailing list software. Encrypts outgoing messages for secrecy. Uses senders' PKI keys for authentication.

A privacy and security aware mailing list manager, for allowing closed groups to interact on the Internet without interference from outsiders and former insiders. Open source in PERL.

Mailing List Server for managing small Intranet as well as large ISP lists services. Supports S/MIME and cryptography.

Sympa version provides security way based on S/MIME : digital signature and messages distribution process using encryption. Sympa's web interface can use HTTPS authentication based on user X509 certificates.