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 is designed for that everyday reality.

"RRegulators 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

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 encrypts 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 tracking helps you confirm delivery and access signals.

That supports control assurance, and it helps teams respond faster when an issue is reported.

Revoke Access to Contain a Mistake

If a message is misdirected, Mailock’s revoke capability provides a practical containment step.

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

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, tracking records 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 revoke, access checks, evidence capture, and escalation into your playbooks, then rehearse them regularly.

5) Check Your CPS 230 Contract Deadline

CPS 230 commences on 1 July 2025. For existing service provider arrangements, transition requirements apply from the earlier of the next renewal date or 1 July 2026.

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

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, tracking, and revoke can support a stronger evidence position for sensitive outbound email.

They can also help you respond faster if something is misdirected, which matters when assessing the impact of a privacy breach.

Key Takeaways

Mailock helps you control sensitive outbound email with encryption, recipient checks, tracking, and revoke.

That could help many organisations in addressing aspects of CPS 230 and CPS 234.

FAQs

Does Mailock Make Us “Compliant” with CPS 230 or CPS 234?

No. APRA assesses compliance at the entity level.

Mailock supports compliance by providing practical controls and evidence for sensitive outbound email, but you still need governance, classification, and tested response processes.

What Is the Most Practical Starting Point?

Define which outbound email types are sensitive, then make Mailock the default control for those use cases.

Once adoption is consistent, build reporting and incident steps around tracking and revoke.

Where Do the CPS 230 Transition Dates Matter Most?

If your secure email provider is considered a material arrangement, review contracts and oversight ahead of renewal dates, and no later than 1 July 2026 for legacy arrangements.

Do We Still Need Incident Playbooks If We Use Secure Email?

Yes. Secure email helps reduce risk and support containment, but you still need clear response steps, rehearsals, and decision-making criteria.

References

Prudential Standard CPS 230 Operational Risk Management, APRA

Prudential Standard CPS 234 Information Security, APRA

Chapter 11: APP 11 Security of Personal Information, OAIC

About the Notifiable Data Breaches Scheme, OAIC

Reviewed by

Sam Kendall, 13.04.26