GFI MailEssentials features a variety of anti-spam technologies designed to put your mind at rest and make life difficult for spammers.
SPF blocks spoofed emails. Greylisting blocks emails sent with non RFC compliant techniques used by spammers. Directory harvest protection blocks emails sent using random and exhaustive email address-generation techniques. And DNS blacklists utilize a wealth of information gathered from distributed community data collection techniques to fend off botnet spamming.
Furthermore spam razor determines if an email is spam utilizing email reputation, bulk email detection, spamming technique detection and extensive content analysis, while Bayesian filtering uses a mathematical approach based on spam and ham (legitimate email).
GFI MailEssentials also includes a 'Language Detection' plugin, that detects and blocks spam in specific languages. Combining these technologies yields a spam detection rate of more than 99 percent.