Best AI-Powered Email Security Alternatives to Proofpoint in 2026

Not entirely. AI-powered email security tools like Abnormal Security and IRONSCALES excel at detecting socially-engineered attacks that lack malicious payloads, but they do not provide the full feature set of a secure email gateway. They do not handle email routing, spam filtering, malware sandboxing, email archiving, or compliance. Most organizations deploy AI email security as a supplementary layer behind Proofpoint or another gateway, creating defense-in-depth where the gateway handles payload-based threats and the AI layer catches social engineering.

Proofpoint primarily operates as a secure email gateway that inspects content, URLs, and attachments using signatures, sandboxing, and threat intelligence. AI email security platforms like Abnormal Security take a fundamentally different approach by building behavioral profiles of every user and detecting anomalies in communication patterns, writing style, and email metadata. This behavioral approach catches attacks where there is no malicious content to scan, such as a CEO impersonation email asking for a wire transfer using only plain text.

For organizations facing significant BEC and social engineering threats, yes. Business email compromise caused over $2.9 billion in reported losses in 2023, and these attacks are specifically designed to bypass gateway detection. Abnormal Security catches BEC attacks that Proofpoint misses because they contain no malicious payload — just persuasive social engineering. If your organization regularly sees executive impersonation, vendor fraud, or invoice manipulation attempts, adding Abnormal Security provides meaningful additional protection.

Proofpoint acquired Tessian to integrate its human layer security technology — particularly misdirected email prevention and behavioral data loss detection — into the Proofpoint platform. Tessian's standalone product continues to operate but its long-term future as an independent offering is uncertain. Organizations evaluating Tessian should consider whether its capabilities will eventually be available natively within Proofpoint, which could eliminate the need for a separate tool.