How Mailock Helps with APRA CPS 230 and CPS 234 Email Controls in Australia

APRA’s prudential standards increasingly emphasise the importance of secure and resilient operational processes, including how organisations communicate sensitive information.

If you’re an APRA-regulated entity, email is often part of your operational and information security risk profile.

It’s where sensitive information moves quickly, often outside your perimeter, and often under time pressure.

Mailock helps you protect sensitive outbound emails, respond faster to mistakes, and show evidence that controls are operating.

APRA Places Emphasis on Demonstrable Controls

Across CPS 230 and CPS 234, a consistent theme is the need for controls that operate effectively in practice and can be evidenced for assurance and audit purposes.

Mailock does not, on its own, ensure compliance with APRA standards.

It supports organisations by providing practical controls that may assist in addressing email-related risks within CPS 230 and CPS 234 frameworks.

The Email Risks These Standards Care About

Email is a business-as-usual channel for customer servicing, claims, payments, member communications, and operational coordination.

It’s also where small mistakes can scale quickly, especially when attachments contain personal or financial information.

The “Email-Shaped” Risks Are Predictable

• Misdirection: messages or attachments sent to the wrong recipient.
• Unauthorised disclosure: sensitive content forwarded, downloaded, or accessed without appropriate checks.
• Compromise: phishing-led credential theft and mailbox takeover.
• Disruption: delayed or unavailable communications during incidents.

APRA Is Looking for Controls You Can Evidence

Across CPS 230 and CPS 234, the theme is consistent.

It’s not enough to say “we have a policy on that...”.

You must have controls that work in real workflows, and records that support assurance, audit, and supervisory conversations.

Mailock fits that everyday sending pattern where teams need protection without replacing email entirely.

"Regulators are not prescriptive about specific technologies. Instead, they expect organisations to demonstrate that sensitive communications are appropriately controlled, monitored, and recoverable."

Harry Holland, Head of Market Development, Beyond Encryption

That expectation sits behind many of the email controls APRA-regulated entities are already reviewing in operational and information security programmes.

How Mailock Helps: Four Practical Controls

Mailock focuses on simple safeguards that map well to common compliance requirements: protect the message, verify the recipient, log evidence, and contain mistakes.

Protect Sensitive Content with Encryption

Mailock applies AES-256 encryption to message content and attachments, helping reduce the risk of readable disclosure if an email is intercepted, forwarded, or mishandled.

Encryption should form part of a broader information security control framework.

Add Recipient Checks Before Access

For higher-risk messages, Mailock can add recipient authentication such as SMS verification or Q&A checks.

This helps to make sure the person opening the message is the person you intended.

Use Tracking to Support Evidence and Triage

Mailock's Message Tracker helps you confirm delivery and access signals.

That supports control assurance through audit trails that cover message activity, and it helps teams respond faster when an issue is reported.

Revoke Access to Contain a Mistake

If a message is misdirected, Mailock's Message Revoke capability provides a practical containment step.

It helps reduce further access while you follow your incident playbook and decide next actions.

"For APRA-regulated teams, supervisors usually want evidence that sensitive messages are protected, that access was checked, and that the firm can show what it did when something went wrong."

Michael Wakefield, CTO, Mailock / Beyond Encryption

Those four controls are most useful when they are mapped to named sensitive email journeys and tested in incident playbooks.

A Simple Way to Apply This in Your Programme

1) Define What “Sensitive Email” Means for You

List the message types that include personal information, financial data, claims documents, statements, hardship information, member data, or identity material.

Consider using Mailock, or another secure delivery mechanism, as the default control for those use cases.

2) Make the Rule Easy to Follow

Update your communications policy and team guidance so it is specific and example-led.

If you use the Mailock Secure Email Gateway (SEG), you can automatically apply policy-based encryption using security alerts for more consistent application at scale.

3) Build Evidence into Business-as-Usual

Decide what you will retain (for example, Message Tracker records and broader audit trails for sensitive sends), how long you will retain it, and who reviews the exceptions.

4) Put Revoke and Tracking into Incident Playbooks

When an email incident happens, teams should know exactly what to do.

Add clear steps for Message Revoke, access checks, evidence capture, and escalation into your playbooks, then rehearse them regularly.

5) Check Your CPS 230 Contract Deadline

If your secure email provider is a material arrangement (for example, it supports critical communications, or a failure could create material operational risk), review contract terms, supplier oversight, and the evidence you will rely on for assurance ahead of renewal dates.

That review is most pressing when secure email supports critical communications or a provider failure could create material operational risk.

Those checks are easier when your secure email controls already produce records teams can review without rebuilding evidence after an incident.

Many APRA-regulated entities also need to align outbound email controls with privacy obligations under the Privacy Act 1988.

How This Supports OAIC Privacy Expectations

Many APRA-regulated entities are also covered by the Privacy Act 1988 and the Australian Privacy Principles (APPs).

APP 11 expects reasonable steps to protect personal information from unauthorised access or disclosure.

What constitutes reasonable steps will depend on the nature and sensitivity of the information and the organisation’s risk profile.

Controls like encryption, recipient checks, Message Tracker, and Message Revoke can support a stronger evidence position for sensitive outbound email.

They can also help you respond faster if something is misdirected, which is relevant when assessing the impact of a privacy breach and whether notification may be required under the Notifiable Data Breaches scheme.

What APRA-Regulated Teams Should Take From This

In practice, Mailock can help teams control sensitive outbound email with encryption, recipient authentication, Message Tracker, and Message Revoke.

That can support evidence for aspects of CPS 230 and CPS 234, without replacing entity-level governance, classification, or tested response processes.

FAQs

What Do APRA CPS 230 and CPS 234 Mean for Email Workflows?

They put pressure on regulated teams to show operational resilience, security controls, and evidence around important communication processes.

Which Email Risks Do the Standards Make Harder to Ignore?

Sensitive data sent to the wrong person, weak access control, poor audit evidence, and supplier dependency can all create operational and privacy risk.

How Can Secure Email Support APRA-Regulated Teams?

Secure email can add encryption, recipient authentication, tracking, and controlled replies to sensitive outbound communication.

References

Prudential Standard CPS 230 Operational Risk Management, APRA, 2023

Prudential Standard CPS 234 Information Security, APRA, 2019

Chapter 11: APP 11 Security of Personal Information, OAIC

About the Notifiable Data Breaches Scheme, OAIC

Reviewed by

Sam Kendall, 25.05.26

This content is for general information only and is not legal advice.