Products - Leon

LEON The Anti-Spam Server is responsible for receiving and classifying the E-mails within a clients company or organization. Its principal function is to impede, close to all, unsolicited commercial emails (UCE). In this way, a company that uses LEON will have a significant return on the following areas and therefore on its Return On Investment:

Economize on the consumption of the bandwidth; Reduction on administration costs of the corporate network; Gain with user/employee productivity; Reduces the threat of viruses and spy wares.

UNIWARES offers a subscription service for LEON that supports the client to be prepared to combat SPAM guaranteeing the constant upgrading of the LEON software and updating of the LEON library via an automatic system developed especially for LEON. UNIWARES maintains within its environment a team of professionals called "LEON Librarian Analysts" trained to up-date the library 7 (seven) days a week.

Leon is built as a proxy mail server. It implements a full RFC 2821/1869 compatible SMTP server.

The split server architecture separates the receiving mail server from the sending server. The receiving server can reside outside the fire walled network only sharing a writeable network drive with the sending server. Thus, the sending server is secure from outside attacks.

Leon contains full support for currently six languages (English, Portuguese, French, Italian, Spanish and German) through separate dictionaries and language specific Spam filters.

For each supported language, it uses specific algorithms, which handle the languages semantics and rules.

Generic self-adapting Bayesian filters using multiple algorithms perform in-depth content analysis.

Additional Regular Expression filters allow filtering of other elements, which are configured by the administrator. This allows exclusion mails containing certain keywords, phrases or patterns.

Mail attachments can be filtered by type and/or size.

Mail headers are checked for RFC compliance and MX chain correctness. Non-compliant mails or MX chains, which fail verification, can be filtered.

Verifies the identity of a TCP connection during initial communication. Connections from either blacklisted senders or senders with false or spoofed information can be blocked.

All incoming mail is extended with full connection information about the senders TCP connection. IP address, resolved host name, claimed host name, port and protocol are logged.

Tar pitting enables delaying communication with sender who flood or otherwise misuse the SMTP service. A delayed connection will respond only closely within the timeout limits defined by the RFC's and thus slowing down the sender by a factor up to 50 times.

The incoming server can be configured as a black hole. This will accept just about any mail address as long as it is in one of the accepted domains. This blocks mail-digging attacks.

Filtered mail may trigger customizable actions, can be forwarded to certain mailboxes, be dropped automatically or can be quarantined until administrative action is taken.

The filters include full DNS based RBL filtering. Databases are configurable. Databases like MAPS, DUL, Spamhaus, etc. are supported by default. Local DNS queries are supported; subscribed RBL providers (through zone transfers) can be used.

The filters include full DNS based RWL filtering. Databases are configurable. Databases like Habeas IP Whitelist are supported by default. Local DNS queries are supported; subscribed RWL providers (through zone transfers) can be used.

White list filtering for mail exchangers (MX), senders, mailing lists, single hosts and recipients allows flexible pass-through configuration for any source or target. White listed items are never filtered out.

Administrators may manually add certain items to the black list filters. Items on these lists are always filtered out, even if they would pass all other filters.

Mailboxes, domains and mail exchangers can be configured as pass-through items. An administrator can setup Leon to pass-through any mail coming from a certain MX; exclude some mail boxes from filtering; or, for ISP operation, exclude filtering for certain domains.

Leon can be configured into a restricted mode. It will then only answer requests from configured hosts. This is useful for gateway operation or in closed environments.

All configurations are performed through Microsoft Management Console (MMC) snap-ins. This reduces administration costs.

Using standard Windows mechanisms for performance measuring, Leon does allow easy integration into standard management tools. Performance counters reflect mail system activity and mail filtering performance.

UNIWARES offers a subscription service, which guarantees the constant up grading of the LEON software and up dating of the LEON libraries via an automatic system developed especially for LEON. These libraries are a fundamental requirement for the efficient control of spam on your email service system. For this reason UNIWARES maintains within its environment a team of professionals called "LEON Spam Catchers" trained to up-date the library 7 (seven) days a week.

For more information just click on the link to download our LEON White Paper (pdf)

For more information about LEON's Technical Specification click here.

Click here for more information about Leon Anti-Spam Server 2005 (PDF Format)