Email Security & Anti-Phishing for Melbourne Businesses

Business email compromise (BEC) is an attack where a cybercriminal impersonates a senior executive, supplier, or business partner via email to trick a staff member into transferring funds or sharing confidential information. The email typically appears to come from a legitimate sender — using display name spoofing, a lookalike domain, or a genuine but compromised email account. BEC does not require malware — it relies on social engineering. It is the highest-value cybercrime category in Australia by financial loss. Our email security controls — anti-impersonation rules, DMARC enforcement, and sender reputation filtering — are specifically designed to detect and block BEC attempts.

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol that tells receiving mail servers what to do when an email fails authentication checks — i.e., when someone tries to send an email pretending to be from your domain. Without a DMARC record in p=reject mode, anyone can send an email that appears to come from yourcompany.com.au. With DMARC, those spoofed emails are rejected before delivery. We configure DMARC, along with the supporting records DKIM and SPF, and monitor DMARC aggregate reports to detect spoofing attempts.

Microsoft 365 includes basic email protection (Exchange Online Protection) that filters known spam and malware. However, the default Microsoft configuration is not sufficient for Australian SMBs handling sensitive data or financial transactions. Microsoft Defender for Office 365 Plan 1 or Plan 2 adds advanced phishing protection, safe links, safe attachments, and anti-impersonation controls — but even these require correct configuration to be effective. CX IT Services configures Microsoft 365 email security to enterprise standards, or deploys a third-party solution when appropriate, and monitors ongoing performance.

Act immediately. The first step is to disconnect the affected device from the network if possible, then contact CX IT Services. We will remotely investigate the endpoint, check for any credential theft or malware installation, scan for any lateral movement across your network, and review email logs for any unauthorised access. Do not wait to see what happens — the first 30 minutes after a phishing click are critical for containment. If you are an existing managed IT client, our incident response process activates immediately.

Yes. The majority of our Melbourne clients use Microsoft 365 for email. We configure Microsoft Defender for Office 365 (Safe Links, Safe Attachments, anti-phishing policies), along with DMARC, DKIM, and SPF records in your DNS. We also configure Exchange transport rules for additional content filtering and set up DMARC monitoring through a reporting platform. This is included as part of our Microsoft 365 managed service and our cyber security engagements.

Advanced email filtering occasionally quarantines legitimate emails — particularly from new suppliers or senders using non-standard configurations. We configure quarantine digest notifications so staff can review and release quarantined messages themselves, and we tune filter policies to reduce false positives based on your specific email patterns. The goal is the right balance between security and operational efficiency — not a zero-tolerance approach that blocks legitimate business communication.

Email security is priced per mailbox per month and covers advanced filtering, URL rewriting, attachment sandboxing, DMARC configuration and monitoring, and monthly threat reporting. For clients on Microsoft 365, we configure Microsoft Defender for Office 365 as part of the service — the licensing cost for Plan 1 is often already included in your Microsoft 365 subscription tier. We provide a fixed-price proposal based on your mailbox count and current configuration.

Email security works as the first layer in a defence-in-depth stack. When a phishing email bypasses the filter and a user clicks a malicious link, EDR on the endpoint detects any resulting malware execution and isolates the device. MFA prevents credential theft from phishing pages from resulting in account compromise. Security awareness training ensures staff know to report suspicious emails that reach the inbox. We design email security as part of the broader security programme, not a standalone product.

Accounting firms face highly targeted BEC attacks, particularly around tax time when large financial transactions are routine and staff are under pressure. Attackers impersonate the ATO, the Australian Business Register, and senior partners to authorise fund transfers or obtain client tax file numbers. We configure specific impersonation protection rules for the ATO and key financial institutions, apply additional scrutiny to emails requesting payment or credential information, and provide finance-team-specific phishing simulation templates reflecting these scenarios.

No filter catches everything. When a phishing email reaches an inbox, the response depends on what the user does. If the user reports it using the Microsoft phishing report button (which we configure as standard), our team investigates within the hour — pulling the email from all inboxes tenant-wide, blocking the sender, and updating filter rules to catch similar variants. If the user clicks before reporting, we escalate to incident response: isolating the device, reviewing access logs for credential compromise, and containing any damage within minutes rather than hours.