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Checklist: Can Your SEG Survive 2026?

Secure email gateways were built for an era of spam, malware, and known-bad payloads.

Key Insights

Phishing and BEC attacks increasingly originate from legitimate infrastructure, allowing them to pass SPF, DKIM, and DMARC undetected.

Modern email attacks are designed with no malicious links, attachments, or payloads, making them invisible to signature-based detection.

Generative AI enables attackers to precisely mimic vendor and executive communication styles, defeating detection based on anomalous language.

SEGs that rely on static rules and analyst triage fail to stop identity-based, payload-free attacks while increasing operational overhead.

Email-based attacks pivot to account takeover and cross-platform movement after delivery, requiring visibility beyond the inbox perimeter.

A 10-point stress test that reveals whether your email security architecture is built for today's attacks—or the ones from a decade ago.

Secure email gateways were built to stop spam, block known malware, and filter suspicious infrastructure. Modern attacks don’t look like any of those things. They pass authentication checks, arrive from legitimate accounts, contain no malicious links or payloads, and are specifically engineered to resemble normal business communication.

This checklist walks through 10 architectural gaps that indicate a SEG may be falling behind the current threat landscape—from detection logic that depends on recognizable indicators, to post-delivery blind spots, to stack redundancy that duplicates native Microsoft 365 or Google Workspace protections. Each item includes a diagnostic question to help security teams evaluate where they actually stand.

Check three or more boxes? Your architecture may be optimized for a threat model that’s already changed.

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