Email Fraud Protection for Australian Businesses

Email fraud protection is a set of email, identity and payment controls that makes common scams harder to deliver and easier to spot. For a business using Microsoft 365, the practical starting point is multi-factor authentication, hardened mail settings, verified payment processes and training that is tested rather than merely recorded.

A spam filter alone is not enough. Most costly email fraud does not depend on a crude virus attachment. It relies on a believable request, a compromised supplier account or a staff member who is busy and trying to be helpful.

What does email fraud protection need to cover?

It needs to cover four points where a fraud attempt can succeed: the message arriving, the recipient trusting it, the attacker accessing an account, and someone approving a payment or data release.

A convincing invoice scam may come from a supplier's real mailbox after that supplier has been compromised. A finance team member may receive a request from what appears to be the director's address, asking for an urgent payment. A payroll officer may receive a fake bank-detail change request. None of those scenarios are solved by asking staff to be more careful.

The best approach combines technical controls with a clear business process. Technology can block known threats, flag suspicious messages and stop unauthorised sign-ins. Your team still needs a simple rule for payment changes, password requests and unexpected document-sharing invitations.

For most small and mid-sized businesses, Microsoft 365 is where this work starts. The settings are available, but they need to be configured to suit how the business actually operates. Overly strict policies can block legitimate customer emails. Loose policies leave too much for staff to judge under pressure.

Which email scams cause the most damage?

Phishing is the broad category. It includes messages that steal Microsoft 365 passwords, install malware or direct staff to a fake sign-in page. These emails often use familiar brands, shared-document notifications or a message that appears to come from a manager.

Business email compromise is more targeted. The attacker impersonates a director, supplier or staff member and asks for money, bank account changes or sensitive information. They may copy the tone of previous emails and send the request at a time when the usual approver is away.

Invoice fraud is especially common where accounts teams process many supplier payments. The email says the supplier has changed banks and provides new details. If the business updates those details without independently checking, the next payment can go to a fraudster.

Account takeover creates a second problem. Once an attacker has access to a real mailbox, they can read correspondence, set forwarding rules and send fraud attempts from a genuine address. That is why a message looking familiar is not proof that it is legitimate.

How should Microsoft 365 be configured?

Start with identity. Every user should have multi-factor authentication enabled, including directors, finance staff and shared administration accounts. An authenticator app is generally stronger than SMS because mobile numbers can be redirected or stolen. Where practical, require MFA for all sign-ins, not only when staff are outside the office.

Next, remove old sign-in methods and review who has administrator access. A staff member should not have global administrator rights because they manage a website or create new user accounts occasionally. Keep administrator accounts separate from everyday email accounts where the business can support that process.

Then review Microsoft 365 email security settings. This normally includes anti-phishing policies, impersonation protection for key people and domains, attachment scanning, suspicious link protection and external sender labelling. The right settings depend on your licence, email volume and the software your business receives invoices from.

Domain protection also matters. SPF, DKIM and DMARC help receiving mail systems assess whether an email claiming to come from your domain is genuine. They do not stop every impersonation attempt, especially messages sent from unrelated lookalike domains. They do make it harder for criminals to spoof your exact domain and help protect customers, suppliers and staff receiving messages that appear to be from you.

Set up mailbox auditing and alerting for risky activity, such as new forwarding rules, repeated failed sign-ins or a sign-in from an unusual location. Alerts are only useful if somebody owns the response. A notification sent to an unattended inbox is not a control.

What should staff do before changing bank details?

They should verify the request using a known contact method. That means calling the supplier on the mobile number already held in your accounting system or contract records, not the number in the email requesting the change.

The same rule applies to urgent payment requests from a director. Use a known mobile number, speak to the person, or follow a documented approval process. Do not reply to the original email and ask whether it is genuine. If the account has been compromised, the fraudster will answer.

For higher-value payments, use two-person approval and separate the person entering bank details from the person authorising payment. This can add a few minutes to a payment run. It is usually a sensible trade-off when one mistaken transfer could cause a serious cash-flow problem.

Write the process in plain language. Staff need to know who can approve changes, what amount triggers a second check and what to do if the request arrives after hours. A policy that sits unread in a folder will not help someone processing invoices at 4.45 pm on a Friday.

Is phishing training enough?

No. Training helps staff recognise common tactics, but it should sit alongside technical controls and a payment verification process. Treat training as a rehearsal, not a once-a-year compliance task.

Short, regular phishing simulations can show where the real gaps are. If staff repeatedly enter credentials into fake Microsoft 365 pages, the answer may be better training. It may also be that the sign-in prompt is too convincing, MFA is not consistently enforced, or the business has no easy way to report suspicious messages.

Give staff one clear reporting method. In Microsoft 365, this may be a report-message function or a nominated internal email address. Explain that reporting a suspicious email is preferable to deleting it quietly, because others may have received the same message.

Training should also cover QR-code scams, fake shared-file notifications and MFA fatigue. MFA fatigue happens when an attacker repeatedly triggers approval prompts and waits for a tired user to accept one. Staff should deny unexpected prompts and report them immediately.

What should happen if someone clicks a fraudulent email?

Act quickly, but do not turn the response into a blame exercise. The first priority is containing access and understanding what happened.

If credentials were entered on a suspicious page, reset the password, revoke active sessions and review MFA methods. Check mailbox rules, forwarding settings, sent items and sign-in activity. If payment details were changed or funds transferred, contact the bank promptly and follow its fraud process. Your legal, financial or insurance adviser can guide any notification obligations that apply to your circumstances.

If the email was sent internally from a compromised account, warn affected staff and suppliers using a verified channel. Review whether the attacker accessed files, contacts or other Microsoft 365 services. Preserve relevant messages and logs before deleting anything.

This is where a documented incident process saves time. It should name the person who can approve account lockdowns, the external IT contact, the bank contact and the communication steps. A one-page process is more useful than a long document nobody can find during an incident.

When do you need help with email fraud protection?

You may not need an ongoing provider if you have a small team, a well-configured Microsoft 365 tenant and someone who can review alerts, users and changes. You do need to be realistic about ownership. If IT has landed on an office manager who is also handling payroll, suppliers and reception, security settings often drift.

A managed IT provider can review the current Microsoft 365 setup, implement agreed controls, monitor the areas included in the service and help maintain the process as staff and suppliers change. Ask what is covered, how alerts are handled during Australian business hours, and what work is outside the monthly scope. The work should be scoped and priced up front.

Sharktech can help Australian businesses harden Microsoft 365, improve email fraud protection and put practical reporting and verification processes in place. We'll tell you whether we're the right fit.

The useful next step is not buying another security tool. Map one recent supplier payment, one new-starter account setup and one suspicious-email report from start to finish. Fix the process first, then automate.