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02/08/2026 11:36 am
TL;DR: Integrated cloud email security must now address phishing, business email compromise, outbound data loss and cloud-native integrations because legacy gateways miss social engineering and mailbox-level abuse, according to KnowBe4. Email security is no longer just filtering mail; it is also controlling identity verification, user behaviour and data exposure at the mailbox edge.
NHIMG editorial — based on content published by KnowBe4: Critical Capabilities When Evaluating Integrated Cloud Email Security
By the numbers:
Questions worth separating out
Q: How should security teams reduce business email compromise risk beyond secure email gateways?
A: They should add controls that operate after delivery and after user interaction, because BEC usually succeeds by exploiting trust and workflow, not by delivering obvious malware.
Q: How can email security fit into identity governance more effectively?
A: Email security should feed identity-aware response, not sit apart from it.
Q: What breaks when organisations rely only on legacy secure email gateways?
A: They miss attacks that do not depend on obvious malware or malicious links, such as BEC, spoofing and contextual manipulation.
Practitioner guidance
- Test post-delivery remediation depth Verify that the platform can remove malicious messages from all affected mailboxes after delivery, not just quarantine at ingress.
- Align sender authentication with behavioural detection Use SPF, DKIM and DMARC as baseline checks, then layer behavioural analysis for BEC indicators such as unusual urgency, timing and payment requests.
- Expand outbound DLP beyond compliance checklists Map sensitive data classes to email policy, including personally identifiable information, protected health information and payment data.
What's in the full article
KnowBe4's full whitepaper covers the operational detail this post intentionally leaves for the source:
- Capability checklists for phishing, BEC, ransomware and post-delivery remediation in cloud email environments
- Policy examples for outbound DLP, encryption and misdirected email prevention across regulated data types
- Architecture guidance for native Microsoft 365 and Google Workspace integrations, including API-based remediation
- Operational considerations for SIEM, SOAR and EDR/XDR interoperability in email security workflows
👉 Read KnowBe4's whitepaper on integrated cloud email security capabilities →
Integrated cloud email security: what IAM teams need to watch?
Explore further
02/08/2026 12:49 pm
Email security is now a control problem for identity governance as much as for threat detection. The article shows that modern attacks increasingly exploit trust in sender identity, user behaviour and mailbox workflows rather than only malicious payloads. That means email controls need to be evaluated as part of wider IAM and fraud governance, not as a standalone filtering layer. For practitioners, the boundary between email security and identity assurance is now operational, not theoretical.
A question worth separating out:
Q: What should teams do when suspicious email activity overlaps with account or mailbox access?
A: They should treat it as a containment event that may require both email and identity response. Review delegated access, recent authentication events, message trace and user interactions together, then isolate impacted accounts or mailboxes before the attacker can continue the fraud chain or spread to other users.
👉 Read our full editorial: Integrated cloud email security is now an identity problem
