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14/07/2026 4:23 pm
TL;DR: Financial institutions are finding that legacy secure email gateways and inbound-only API tools miss phishing, impersonation, business email compromise, and outbound data loss, while also creating heavy tuning overhead, according to Proofpoint. The practical shift is toward unified email governance that covers detection, exfiltration risk, and operational simplicity together.
NHIMG editorial — based on content published by Proofpoint: financial institutions modernise email security with API-based inbound and outbound protection
By the numbers:
- With Proofpoint Collaboration Security Prime, the organisation deployed comprehensive inbound email protection via API in just 48 hours, with less than a day needed for configuration.
Questions worth separating out
Q: What breaks when organisations rely only on inbound email security controls?
A: Inbound-only controls leave two major gaps.
Q: Why do targeted phishing campaigns still work against mature organisations?
A: Targeted phishing works when the attacker is quiet, context-aware, and able to use legitimate credentials or trusted workflows after initial access.
Q: How do security teams know if their email controls are actually overlapping?
A: Look for the same threat categories being claimed by both layers, the same messages being inspected twice, and the same native protections being disabled to keep the SEG functional.
Practitioner guidance
- Map email controls to identity risk paths Tie phishing, impersonation, and BEC monitoring to the identities, groups, and approval chains that can turn a mailbox compromise into business impact.
- Validate outbound DLP coverage for regulated data Test whether outbound controls can detect accidental disclosure and intentional exfiltration through email, including personal-recipient destinations and attachments with sensitive records.
- Measure control debt in email operations Track how often policy changes, allow-list updates, and false-positive tuning consume analyst time.
What's in the full article
Proofpoint's full blog covers the operational detail this post intentionally leaves for the source:
- Configuration steps for API-based inbound and outbound email protection in Microsoft 365.
- How Adaptive Email DLP is applied to accidental disclosure and intentional exfiltration scenarios.
- The evaluation criteria used to compare gateway-era controls with modern platform coverage.
- The deployment experience for a regulated bank moving from Cisco IronPort to an API-first model.
👉 Read Proofpoint's analysis of modern email security for regulated banks →
Email security for banks: why inbound-only controls no longer hold?
Explore further
14/07/2026 4:31 pm
Email security has become an identity governance problem, not just a messaging problem. The article shows that phishing, impersonation, and BEC succeed because attackers exploit trust in legitimate identities, not because the mail channel itself is inherently weak. When a bank cannot distinguish malicious intent from legitimate message flow fast enough, email controls become part of identity assurance. Practitioners should treat mailbox protection, recipient verification, and outbound risk as a single governance surface.
A question worth separating out:
Q: Who should be accountable when a compromised mailbox leads to fraud or access loss?
A: Accountability should sit with the teams that own email governance, identity recovery, and business approval controls together. Security, IAM, and finance cannot treat mailbox abuse as someone else’s problem. Where email is tied to approvals or resets, accountability must include the process owner, not only the mailbox administrator.
👉 Read our full editorial: Financial email security now needs inbound and outbound control
