Email security best practices
Reduce phishing, spoofing and invoice fraud with authentication, filtering, and habits your team can maintain.
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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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More guides
Fix SPF for Microsoft 365
Stop legitimate email bouncing or landing in spam by getting your SPF record right for Microsoft 365.
- Why SPF matters
- The Microsoft 365 include
Set up DMARC for your business
Move from none to quarantine with a policy that protects your domain from spoofing without breaking legitimate mail.
- What DMARC actually does
- Start with monitoring