Email Security

Email security refers to the technologies and practices that protect email systems from unauthorized access, data theft, and malicious threats like phishing and ransomware. For enterprises managing AI governance, email security is critical because sensitive compliance documentation, model training data, and policy communications often transit through email systems that require encryption and access controls. Organizations must implement email security measures to maintain audit trails and prevent inadvertent disclosure of proprietary AI systems or regulated data that could violate governance frameworks.

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ResearchGlobal2026-09-04

ASCII Smuggling Bridges Email Phishing and AI Prompt Injection at Scale

Microsoft researchers documented a phishing campaign exceeding 2.37 million messages that repurposed ASCII smuggling, a technique originally associated with AI prompt injection, to evade email content filters using invisible Unicode characters. The campaign targeted financial keywords and ran from late February through mid-June 2026 across roughly 150 disposable domains. Microsoft's recommended defense, stripping invisible Unicode before content evaluation, applies equally to email filters and AI assistant input pipelines.

Microsoft prompt injection ASCII smuggling phishing Unicode AI security email security financial services