G-Lock SpamCombat's approach to spam detection is based on the following key methods and technologies:

• SpamCombat catches and deletes spam BEFORE it reaches your inbox.
   
• SpamCombat is supplied with a set of powerful filters to catch spam emails: Complex filters, HTML Validator, Bayesian filter, and DNSBL filter.

Complex Filter is a script (or scripts) that uses various functions, procedures, or operators to compare any fields from the message headers to the defined value andthen classifies the email as spam or legitimate depending on the result.

HTML Validator is a filter that parses the HTML part of the incoming email and checks the HTML tags for validity. If several dubious HTML tags are found, the message is considered spam.

The Bayesian filter is the most powerful anti-spam filter based on the analysis of the message content and mathematical calculation of spam. The advantage of the Bayesian filter is that it can be trained by each individual user by categorizing each received email as either spam or good. Read more about the Bayesian filter here.

DNSBL filter consists in comparing the senders' IP addresses against a list of known spam databases using Public Blacklists (also called DNSBL lists). These databases are maintained and updated daily.

SpamCombat also provides you with flexible and easy to edit and update blacklist and whitelist, which helps reduce false positive and false negative results. The blacklist includes a range of sub-filters that allow catching all most wide known spam emails. The whitelist should be created by a user. Here you can add the email messages that can never be spam, for instance, newsletters, notification letters about new updates or software releases, other email news you are subscribed to receive.

• SpamCombat retrieves from the server the messages headers and a defined number of lines from the messages bodies thus providing you an easy way to preview all the emails to avoid false negatives and false positives. The email preview is absolutely safe. No pictures are actually downloaded, no hidden scripts or codes are executed.
   
• User definable deletion mode for spam emails - spam can be automatically deleted from the server, or you can manually delete unwanted emails and leave only legitimate ones. Furthermore, you can choose to either move spam emails to trash (separate folder in SpamCombat), or delete them permanently.
   
• Easy way to recover deleted emails - SpamCombat provides you the ability to restore an email if it was accidentally marked as spam and trashed.