Email5 min read

Email security best practices

Reduce phishing, spoofing and invoice fraud with authentication, filtering, and habits your team can maintain.

By MrTech MelbournePublished 10 Apr 2026Updated 2 June 2026

Authenticate your domain

Publish correct SPF, enable DKIM, and move DMARC from monitoring to quarantine when legitimate senders are mapped. Without all three, attackers can impersonate your domain and damage deliverability for real invoices and quotes.

Filter before the inbox

Use Microsoft 365 Defender presets or equivalent DNS filtering. Block known malicious attachments, scan links at click-time where licensed, and flag external senders with a banner so staff pause before trusting urgent payment requests.

Train for the real attacks

Short annual training is not enough — share examples of Melbourne supplier impersonation, payroll redirection, and fake SharePoint links your industry sees. Make reporting suspicious mail one click and celebrate catches, not only mistakes.

Operational habits

Verify bank detail changes by phone using a known number, use admin-only workstations for finance systems, and never approve MFA prompts you did not initiate. Run email and blacklist checks after any deliverability incident or spam spike.

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