Users of 4SecureMail have access to a powerful automatic system designed to identify, quarantine and eliminate unsolicited commercial email (Spam) messages while allowing legitimate mail without causing false positives.
There are two primary anti-spam features used by the system -- the filter itself and the challenge/response feature.
The Spam Filter
4SecureMail includes an advanced network-based Spam Filter, which is a carrier-grade ISP spam detection system. User configurable options can be setup to filter spam based on user preferences.
The Spam Filter uses a combination of filter-rules and centralized black list matching to correctly identify over 90% of spam. Individual users select their own 'level' of spam tolerance. Typically the system is set up to automatically bounce 'definite' spam and allows users to decide what to do with 'suspected' spam.
The challenge/response option takes it a step further, creating a nearly 100% spam-free solution by allowing users to choose to receive messages only from known senders. Mail from unknown senders is automatically questioned to determine if the sender is a machine or a human. All mail from unknown senders is held in quarantine on the email server until the sender has confirmed that it is not spam.
Following is the path that an email message, sent to a typically configured 4SecureMail account, takes through the system before it is delivered to the users inbox:
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