SPAM Filter

Overview

A spam filter is a system that automatically detects and blocks unwanted messages like phishing, malware, and junk ads while allowing legitimate communication. It uses techniques such as keyword rules, blacklists/whitelists, Bayesian filtering, header and content analysis, and heuristic scoring. Modern filters leverage AI and machine learning to adapt to new spam tactics. They can operate at email client, network, application, or cloud levels. Challenges include false positives, false negatives, and evolving threats. Best practices include regular updates, multi-layered filtering, email authentication (SPF, DKIM, DMARC), and user feedback for accuracy.

Our Solution

Graphus is a cloud-native email security solution designed for Microsoft 365 and Google Workspace that combines AI-driven phishing defense with personalised spam protection. It builds dynamic “trust profiles” by analyzing communication patterns who users interact with and how often to detect anomalies and block sophisticated threats that traditional filters miss.

Automated threat detection & quarantine: Scans real-time and historical communication, flagging phishing, ransomware, business email compromise (BEC), account takeover (ATO), malware, and zero-day attacks.

EmployeeShield warning banners: Suspicious emails are marked with banners, giving users a clear alert and ability to mark messages as safe or report them.

Phish911 reporting: Allows users to report suspected threats directly, triggering quarantines across the organisation and aiding IT investigation.

Personal Spam Filter: Supplements Microsoft 365 or Gmail spam filters by enabling users to individually block graymail (e.g., newsletters) via one-click blocking. Admins can also enforce organisational-wide blocking rules.

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