GreatHorn Mailbox Intelligence vs NotifySecurity: Side-by-Side Comparison (2026)

GreatHorn Mailbox Intelligence: Email security tool empowering users to identify & report phishing threats. built by GreatHorn. Core capabilities include Visual sender and domain trustworthiness indicators, In-email banner notifications for suspicious messages, User-initiated phishing reporting capabilities..

NotifySecurity: An Outlook add-in that enables one-click reporting of suspicious emails to security teams with integrated statistics tracking and SMTP header collection..

Both serve the Anti-Phishing market but differ in approach, feature depth, and target audience.

GreatHorn Mailbox Intelligence is developed by GreatHorn. NotifySecurity is open-source with 133 GitHub stars. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

GreatHorn Mailbox Intelligence and NotifySecurity serve similar Anti-Phishing use cases: both are Anti-Phishing tools. Key differences: GreatHorn Mailbox Intelligence is Commercial while NotifySecurity is Free, NotifySecurity is open-source. Review the feature comparison above to determine which fits your requirements.