Microsoft 365 Security and BEC Prevention

JCPIT helps small businesses secure Microsoft 365 with practical checks, not jargon. We focus on the controls that usually matter first: MFA, admin access, email rules, sharing, backup and monitoring.

Source: Microsoft security guidance and ACSC advice on account protection and phishing.

Microsoft 365 security checklist

If your business uses Microsoft 365 for email, files, and Teams, these are the basics to confirm first. If any item is missing, treat it as a gap.

1. MFA on every account — especially global admins, finance users, and anyone who can change security settings.
2. Separate admin accounts — keep admin access away from daily email accounts and document who can use each one.
3. Conditional access and legacy auth blocks — require stronger sign-in rules for risky logins and turn off basic authentication.
4. Email authentication — make sure SPF, DKIM and DMARC are set up and aligned so lookalike mail is harder to send.
5. Mailbox rules and app consent — review auto-forwarding, hidden inbox rules, and third-party app access.
6. External sharing — limit who can share files, invite guests, or expose SharePoint and OneDrive data.
7. Backup and monitoring — back up Microsoft 365 data separately and watch sign-ins, admin changes, and unusual sharing.

What a gap usually means

Missing controls do not always mean there is an active attack, but they do mean the tenant is easier to abuse. That is where managed support helps: we can review the setup, tighten the controls, and keep an eye on the warnings that matter.

• find the weak spots in your Microsoft 365 setup
• set up or tighten the security controls above
• review mailbox rules, admin accounts, and risky sign-ins
• help with backup coverage and recovery planning
• explain what changed in plain English

See how that work looks in practice in How JCPIT Hardens a Small Business in 30 Days.

Next step

Start with a quick risk snapshot, or ask for a quote if you already know you need help.