GFI Launches Freeware version of Exchange Server Anti-Spam Product

Exchange administrators can check mail against popular blacklists such as ORDB & Spamhaus

London, UK, 5 March 2003 – As a contribution to the battle against spam, GFI today launched a freeware version of GFI MailEssentials for Exchange/SMTP 8. The free version allows incoming email to be checked against popular DNS blacklists (also known as real time blacklists) at server level, prior to distributing the mail to network users. It also enables administrators to set up their own blacklists and includes a patented automatic whitelist management tool.

Third party DNS blacklists (DNSBL)

DNS blacklists are databases of known spammers, through which administrators can check if a sending mail server is known or thought to send spam. Two recommended DNS blacklists supported by GFI MailEssentials 8 are and

The ORDB list is a database maintained by, a non-profit organization that stores the IP addresses of verified open SMTP relays. These relays are likely to be used as conduits for sending unsolicited bulk email. By accessing this list, system administrators can choose to accept or reject email exchange with servers at these addresses.

The Spamhaus Block List (SBL) is a free real time DNS-based database of IP addresses of verified spammers, spam gangs and spam services. Used by Internet service providers and corporate networks worldwide, the SBL currently protects an estimated 100 million mailboxes from persistent spam sources.

Steve Linford, director of The Spamhaus Project, welcomed GFI’s announcement of the freeware version: “We are pleased that GFI MailEssentials 8 is available as freeware, now enabling Exchange users to use our Spamhaus Block List (SBL) easily and free of charge to block spammers.”
How blacklist checking works

Once an administrator installs GFI MailEssentials 8 on Exchange Server 2000, incoming mail is checked against the selected third party blacklist. No extra configuration is required. For each incoming mail, the IP of the sending mail server is queried against the list in a similar fashion as a DNS query. If the sending mail server is on the blacklist, the mail is flagged as spam and optionally forwarded to a public folder. GFI MailEssentials also supports Exchange 5.5, Lotus Notes and SMTP mail servers.

Automatic whitelist management

The freeware version of GFI MailEssentials 8 also includes a patented automatic whitelist management tool. This feature eliminates the need for administrators to manually input approved addresses on the whitelist, because all business partners are added automatically. This way, their mail bypasses the spam filter and false positives are greatly reduced.

Ability to configure local blacklists

Another anti-spam feature included in the free version is the ability for Exchange administrators to create their own list of undesirable domains and email addresses from which they do not want to receive mail.

Obtaining the freeware version

The freeware version can be downloaded from The download is a trial version of GFI MailEssentials (3Mb), however the blacklist checking and whitelist features remain active after the 60-day evaluation period. Quick install instructions can be obtained at Alternatively, the entire GFI MailEssentials 8 manual can be downloaded from User-to-user support is available at

About GFI

GFI is a leading provider of Windows-based anti-spam, content security, network security and messaging software. Key products include the GFI FAXmaker fax connector for Exchange and fax server for networks; GFI MailSecurity email content/exploit checking and anti-virus software; and the GFI LANguard family of network security products. Clients include Microsoft, Telstra, Time Warner Cable, Shell Oil Lubricants, NASA, DHL, Caterpillar, BMW, the US IRS, and the USAF. GFI has five offices in the US, UK, Germany, Australia and Malta, and has a worldwide network of distributors. GFI is a Microsoft Gold Certified Partner and has won the Microsoft Fusion 2000 (GEM) Packaged Application Partner of the Year award.

All product and company names herein may be trademarks of their respective owners. In addition to GFI MailSecurity, GFI also produces the GFI FAXmaker fax server & GFI LANguard network security product ranges. For more information on our products, please visit This disclaimer was sent by GFI MailEssentials for Exchange/SMTP.

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