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GFI server-based anti-spam freeware. (Security).

GFI have 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 spare. 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 e-mail 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, spare gangs and spare services. Used by Internet service providers and corporate networks worldwide, the SBL currently protects an estimated 100 million mailboxes from persistent spare sources.

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 spain filter and false positives are greatly reduced.

Ability to configure local blacklists

Another anti-spare 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
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Publication:Database and Network Journal
Geographic Code:1USA
Date:Apr 1, 2003
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