Topic starter
27/06/2026 1:13 pm
TL;DR: Security teams relying on Microsoft 365 or legacy secure email gateways face blind spots in behavioural context, more false positives, and SOC fatigue when identity-based, AI-powered attacks move faster than rule-based filters, according to Abnormal AI. Traditional email controls were not designed for this attack pattern, so “good enough” protection can still leave operational drag and business risk.
Editorial analysis by NHI Mgmt Group, based on content published by Abnormal AI: “Exposing the Gaps in M365 and Legacy SEG Protection”.
Key questions
Q: Where do rule-based email controls fail against identity-based attacks?
A: They fail when the attack depends on behavioural context rather than obvious malicious wording or known-bad infrastructure.
Q: Why do legacy SEG and native email controls create SOC fatigue?
A: Because controls that cannot reliably separate benign variation from suspicious behaviour produce too many ambiguous alerts.
Practitioner guidance
- Evaluate email security against behavioural context Test whether your current controls can distinguish routine communication from identity-based attack patterns that only become visible when message context is combined with sender behaviour, relationship history, and workflow timing.
- Quantify false-positive operating cost Measure analyst time, user friction, and tuning effort separately so that alert noise is treated as a control outcome with business cost rather than a generic SOC inconvenience.
- Review reliance on native and SEG-only coverage Map where Microsoft 365 or a legacy third-party SEG is acting as the sole email control and identify which attack classes still require additional identity-aware detection or workflow correlation.
Bottom line: Email security gaps emerge when controls can filter text but cannot reliably interpret behavioural trust and identity context.
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This topic was modified 3 days ago by NHI Mgmt Group
27/06/2026 2:29 pm
Identity-based email attacks expose a behavioural-context gap, not just a filtering gap. Traditional email security assumes that suspicious content can be recognised from the message itself. That assumption breaks when attackers use believable identity cues, social engineering, and contextual mimicry to make malicious mail look operationally normal. The practitioner lesson is that email controls now need to understand trust relationships, not just text patterns.
A few things that frame the scale:
- 96% of security operations teams report critical blind spots, most commonly in cloud infrastructure (74%) and identity and access behaviour (67%).
A question worth separating out:
Q: How should security teams decide whether to move beyond email-only protection?
A: They should move when email controls no longer provide enough identity-aware context to support accurate decisions at acceptable cost. If the team cannot distinguish attack intent from normal business communication without heavy manual review, the email layer needs a broader detection model.
👉 Read our full editorial: Email security blind spots expose identity-based AI attacks
This post was modified 3 days ago by NHI Mgmt Group