MailGuard is a cloud-based email filtering service that provides inbound and outbound email security for organizations using on-premise or cloud-hosted email platforms. The service uses proprietary IP threat detection engines combining heuristic algorithms, machine learning (ML), and generative AI to detect and block email-borne threats including phishing, spear phishing, ransomware, business email compromise (BEC), spam, viruses, and malware. Deployment is performed via an MX record change with no additional hardware, software licensing, or administrative overhead required. It is delivered as a fully managed SaaS solution supported by a 24x7 security operations team. Key functional areas include: - Inbound and outbound email filtering with anti-spam, anti-virus, and anti-malware engines - Content security policies for inbound messages based on file type, keywords, size limits, and blacklisted IPs or domains - Outbound policy enforcement covering message size, attachments, keywords, disclaimers, and compliance requirements - Data leakage protection using file fingerprint technology and regex-based pattern matching - Denial of Service and directory harvesting attack detection and mitigation - Anti-spoofing support via Sender ID and Sender Policy Framework (SPF) - Email quarantine management with end-user spam quarantine release functionality - Comprehensive reporting including per-user anti-spam reports, bandwidth reports, virus/malware reports, and policy breach reports in HTML and PDF formats The service operates on a globally distributed, load-balanced, fault-tolerant mesh of clusters with a 100% uptime and email delivery SLA guarantee.