Clement is an email server application. Its main function is to block unwanted mail (spam) as soon as possible in the email exchange process. It accepts or rejects email while the SMTP session, initiated by the email sender, is still pending, accepting legitimate email messages without the need to return an error status to non-existent or "borrowed" return address later. Clement can operate in two modes. Either the mail is taken into account locally and stored in the recipient’s own area, or it can transmit the mail to an another SMTP server (Sendmail, Postfix, Exim, Exchange, etc.). Each email domain name Clement knows about can be treated in one of these two modes depending on the group to which the domain name has been set. Each message is verified by a virus scanner (ClamAV) while the SMTP connection is still open, but the refusal of mail and the reason for refusal is notified to the actual sender. Mail management is done via a Web interface and can be delegated to three administrative levels (Root-Admin, Group-Admin, Domain-Admin). Standard users can access their own logs (sent email status, email rejected, quarantined email, etc.). With this interface, the user can handle the rejection and acceptance of mail. Users who are level "Admin" can access the session logs (via the Web interface). Clement uses a SQL database (PostgreSQL, MySQL) to store and manage logs, user profiles, and dynamic management of directives concerning the sender-receiver relationship.
Release Notes: Many improvements were made. "Quarantine list scheduler" can now be defined from the Web interface. Clement is now able to classify an IP as "fully banned" according previously received email. Statistical information about "to be banned server" is extracted from previous email logs within the database. A SMTP protocol extension allows a server within a trusted mesh to share data about banned remote servers. User authentication using IMAP protocol is now available (group in remote server mode). A SSL port is now available for receiving encrypted email.
Release Tags: Banned server, IMAP, SSL, quarantine
Tags: sendmail, Postfix, MTA, Web Interface, Filter, Virus, clamav, Firewall, SMTP, quarantine, SPAM, virtual domain
Licenses: GPLv2