Most small businesses using Microsoft 365 have at least one significant security gap. Hamilton365 has compiled this practical checklist based on the findings from hundreds of M365 tenant reviews. Use it to assess your current security posture.
1. Enable MFA for all users, including the business owner. No exceptions. 2. Remove or consolidate Global Admin accounts, maximum 2–4, on dedicated accounts not used for daily work. 3. Block legacy authentication protocols, they bypass MFA entirely. 4. Enable DKIM for your domain in Microsoft 365. 5. Publish a DMARC record and progress it toward p=reject. 6. Configure SPF to include all legitimate sending sources. 7. Review external sharing settings in SharePoint and Teams. 8. Enable Microsoft 365 audit logging. 9. Check Microsoft Secure Score and action the top recommendations. 10. Review guest accounts and remove any without active business purpose.
If none of these are currently in place, start with MFA. If MFA is already in place, the DMARC/DKIM/SPF trio is typically the next highest-impact area. Hamilton365 provides M365 security assessments for Brisbane businesses, from $299 for an email security health check to $599 for a full tenant review.
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