Reviewing who has access to your Microsoft 365 email and what they can do with it is a critical step for any small or mid-sized business. Over time, employees change roles, leave the company, or require different permissions, and without regular checks, outdated or excessive access rights can remain active. This can lead to accidental data leaks, unauthorized email access, or compliance issues that put your business at risk.
Why regular reviews matter for your business
Microsoft 365 email permissions control who can read, send, delete, or manage your company's email data. If these permissions are too broad or not updated, it increases the risk of cyberattacks, insider threats, and data loss. For example, a former employee might still have access to sensitive customer emails, or a team member might have more privileges than necessary, increasing the chance of accidental data exposure. This can disrupt operations, damage customer trust, and complicate compliance with regulations like HIPAA, PCI DSS, or SOC 2.
A practical example
Consider a 50-person healthcare consulting firm in the US. They use Microsoft 365 for email and document sharing. When a project manager left the company, their email account was disabled, but their delegate permissions to access a shared mailbox were overlooked. Months later, a compliance audit flagged this as a risk because the ex-employee still had access to protected health information (PHI). The company's IT partner helped them identify and remove all outdated permissions, implemented a quarterly review process, and set up alerts for permission changes to prevent future lapses.
Checklist for reviewing Microsoft 365 email permissions
- Identify all users with email access: List current employees, contractors, and service accounts with mailbox or delegate permissions.
- Review permission levels: Check who has full mailbox access, send-as, or send-on-behalf rights, and confirm if these are still needed.
- Audit shared mailboxes and distribution groups: Ensure only authorized personnel have access and that membership is current.
- Verify multi-factor authentication (MFA): Confirm MFA is enabled for all users with elevated email permissions to reduce unauthorized access risk.
- Set a regular review schedule: Quarterly or semi-annual permission audits help catch changes promptly.
- Ask your IT provider: How do you track and report email permission changes? Can you automate alerts for unusual access or permission grants?
- Check compliance controls: Ensure logging of access and permission changes is enabled for audit readiness, especially if under HIPAA, PCI DSS, or SOC 2 requirements.
Next steps
Regularly reviewing Microsoft 365 email permissions is a manageable but essential practice to protect your business data and maintain compliance. If you don't have the time or expertise to perform these reviews yourself, consider engaging a trusted managed IT provider or IT advisor. They can help set up processes, tools, and policies tailored to your business size and industry, ensuring your email environment stays secure and compliant without disrupting daily operations.