SpamTitan for Office 365 is an email security solution designed to supplement Microsoft 365's native spam filtering capabilities. It operates as an additional layer of protection against phishing, spear phishing, business email compromise (BEC), and zero-day attacks. The solution can be deployed as a cloud-based gateway or on-premises, and is administered via a web-based portal without requiring endpoint agents. It synchronizes with Active Directory and LDAP for user management. Core filtering capabilities include: - AI-driven anti-phishing with zero-day threat detection using Bayesian analysis, heuristics, and machine learning - Dual anti-virus scanning for inbound and outbound emails - URL filtering against blacklists of known malicious sources - Greylisting to mitigate attacks from unknown sources - Six dedicated Real-Time Blacklists (RBLs) - Sandboxing for advanced email threat analysis - Attachment blocking by file type, configurable per domain Policy and management features include customizable spam confidence levels per user, group, or domain, along with whitelisting and blacklisting of senders and IP addresses. Outbound email scanning is included to prevent IP reputation damage. Data Leak Prevention (DLP) rules are available to reduce the risk of internal data exposure. Quarantine reporting gives end users visibility and control over their held messages. The product is positioned for use by businesses and Managed Service Providers (MSPs), offering multi-tenancy support and monthly per-user billing. It claims a 99.9% spam catch rate and a 0.003% false positive rate.