Anti-Phishing and BEC Protection
Review impersonation protection, anti-phishing policies, external sender warnings, mailbox rules, forwarding controls, Safe Links, Safe Attachments, and risky sign-in patterns.
Email security risk check
Microsoft 365 email security services
Secure Microsoft 365 Email, Identity, and Collaboration
OC Security Audit helps Irvine, Orange County, Los Angeles County, and Southern California organizations harden Microsoft 365 and Office 365 against phishing, ransomware, credential theft, business email compromise, data leakage, and compliance gaps.
MFAConditional Access and identity hardening
DefenderAnti-phishing, Safe Links, and Safe Attachments
DLPEncryption, sensitivity labels, and data protection
AuditLogging, monitoring, evidence, and compliance readiness
Why Microsoft 365 email security matters
Email is still the front door for account compromise.
Attackers target Microsoft 365 because one compromised mailbox can expose email, OneDrive files, SharePoint content, Teams conversations, vendor communication, financial workflows, password reset paths, and sensitive client data. Default settings are rarely enough for organizations with regulated data, cyber insurance requirements, executive users, remote work, or compliance pressure.
OC Security Audit reviews Microsoft 365 email security as part of a broader business risk picture: identity, endpoint protection, DNS authentication, external sharing, admin accounts, audit logging, backups, incident response, and evidence readiness. For a broader tenant review, see the Microsoft Office 365 security audit and the Microsoft 365 Copilot security readiness assessment.
What we review and harden
Layered Microsoft 365 protection for email, identity, data, and compliance.
Microsoft 365 email security is not only spam filtering. A practical review connects Exchange Online, Defender for Office 365, Entra ID, Conditional Access, DLP, audit logging, endpoint risk, and business continuity.
Identity and Conditional Access
Review MFA enforcement, legacy authentication, risky users, administrator accounts, device compliance, location policies, session controls, and privileged access risks.
Identity assessment toolDLP, Encryption, and Data Protection
Review data loss prevention, sensitivity labels, retention, message encryption, external sharing, compliance boundaries, and regulated information handling.
Data protection assessmentDNS and Email Authentication
Review SPF, DKIM, DMARC, domain spoofing exposure, third-party senders, mail flow rules, transport settings, and sender authentication gaps.
Microsoft 365 auditLogging and Incident Readiness
Review audit logging, alert policies, mailbox access records, compromised account response, investigation workflow, evidence preservation, and executive reporting.
Incident response supportCompliance and Cyber Insurance
Map Microsoft 365 controls to HIPAA, IRS WISP, SOC 2, NIST, PCI DSS support needs, customer security reviews, and cyber insurance questionnaires.
Compliance consulting
Microsoft-native controls
Use the security features you already own, configured the right way.
Many organizations pay for Microsoft 365 security capabilities that are only partially configured. OC Security Audit helps identify which controls should be enabled, tuned, documented, monitored, and validated based on your license level, industry, risk profile, and operational reality.
- Microsoft Defender for Office 365 policy review
- Exchange Online Protection and mail flow control review
- Entra ID identity protection and Conditional Access review
- DLP, sensitivity labels, encryption, and retention review
- Admin account, mailbox delegation, and external sharing review
- Audit logging, alerting, incident response, and evidence readiness
Complete Office 365 security components
Technical controls we review, secure, document, and validate.
OC Security Audit reviews the full Microsoft 365 and Office 365 security stack, including identity, MFA, Conditional Access, email protection, DNS authentication, DLP, logging, collaboration security, backup readiness, and compliance controls.
Microsoft Entra ID and Identity Security
- User, disabled account, stale account, guest user, and external user access review
- Privileged admin, break-glass, service account, shared mailbox, and mailbox delegation review
- Role-based access control, least privilege, Entra admin role assignment, risky users, risky sign-ins, password policy, and passwordless readiness
- Legacy authentication and access exposure review
Multi-Factor Authentication
- MFA enabled for all users and enforced for administrators
- Conditional Access MFA policies and MFA registration status review
- Phishing-resistant MFA, Microsoft Authenticator, FIDO2 security key, and certificate-based authentication readiness
- SMS and voice MFA risk review, MFA bypass, exclusions, and break-glass exception control
Conditional Access Policies
- Require MFA for risky sign-ins and administrators
- Block legacy authentication and high-risk country access where appropriate
- Require compliant devices, managed devices, and approved client apps
- Restrict access to admin portals, apply session controls, and review sign-in risk, user risk, report-only testing, and emergency access exclusions
Administrator and Privileged Access Security
- Global, security, Exchange, SharePoint, and Teams administrator review
- Privileged Identity Management review
- Admin MFA enforcement and admin account separation
- Admin audit logging, admin role minimization, and just-in-time access recommendations
Exchange Online Email Security
- Anti-spam, anti-malware, anti-phishing, quarantine, spoof intelligence, and Zero-hour auto purge review
- Safe Links, Safe Attachments, BEC protection, impersonation protection, and executive/domain/user impersonation protection
- Mail forwarding rule detection, suspicious inbox rule review, external sender tagging, transport rules, mail connectors, accepted domains, and message trace capability
DNS, Domain, and Email Authentication Security
- SPF, DKIM, and DMARC setup, validation, enforcement, and reporting review
- MX, Autodiscover, CNAME, public DNS exposure, subdomain, and parked domain protection
- Look-alike domain risk review
- Third-party sender, marketing platform, copier/scanner SMTP relay, and website contact form sender validation
Advanced technical review
Defender, DLP, encryption, logs, collaboration, endpoint access, and backup readiness.
The original technical page included detailed review areas beyond email filtering. Those controls matter because Microsoft 365 security is a connected system: identity decisions affect email, endpoint posture affects Conditional Access, DLP affects Exchange, SharePoint, OneDrive, and Teams, and logging determines how quickly a compromised account can be investigated.
- Microsoft Defender for Office 365: licensing, preset security policy, Standard vs. Strict protection, threat policies, Safe Links, Safe Attachments, campaign detection, attack simulation readiness, user-reported message workflow, Threat Explorer, automated investigation and response, alerts, and quarantine management.
- Data Loss Prevention and sensitive data protection: HIPAA PHI, PCI cardholder data, Social Security numbers, financial data, sensitive attachments, outbound email DLP, SharePoint DLP, OneDrive DLP, Teams DLP, Endpoint DLP where licensed, user warnings, policy tips, auto-encryption rules, compliance alerts, and external sharing restrictions.
- Email encryption and message protection: Microsoft Purview Message Encryption, automatic encryption rules, manual encryption options, Do Not Forward policies, external recipient encryption, sensitive attachment encryption, TLS, mail flow encryption, HIPAA, and confidential data workflows.
- Logging, auditing, and monitoring: unified audit log status, audit retention, admin activity logging, mailbox audit logging, sign-in logs, risky sign-ins, message trace, DLP alerts, Defender alerts, compliance alerts, forwarding rule alerts, impossible travel, suspicious inbox rules, SIEM integration, and incident investigation readiness.
Collaboration, endpoints, backup, and compliance
Microsoft 365 security must cover more than Exchange Online.
Business email compromise often expands into file access, Teams conversations, OneDrive sync, mobile apps, endpoints, and backup/recovery gaps. A complete review includes the following technical areas.
SharePoint and OneDrive Security
External sharing, anonymous link restrictions, default link type, sharing expiration, guest access, sensitive sites, site owners, data classification, DLP, OneDrive sync restrictions, ransomware recovery readiness, versioning, recycle bin, and retention review.
Microsoft Teams Security
Guest access, external access, Teams file sharing, meeting policy, chat retention, channel retention, DLP for Teams, app permissions, third-party apps, Teams recording storage, and sensitive team membership review.
Endpoint and Mobile Device Access
Intune readiness, mobile device access policy, Outlook mobile app protection, device compliance requirements, Conditional Access by device health, lost device data protection, remote wipe readiness, BYOD policies, app protection policies, and Windows security baseline review.
Office 365 Backup and Recovery
Exchange Online, SharePoint, OneDrive, and Teams data backup review; retention vs. backup clarification; accidental deletion recovery; ransomware recovery planning; legal hold; retention policy; third-party Microsoft 365 backup recommendations; recovery testing; and backup access control.
Compliance, Retention, and eDiscovery
Retention policy, litigation hold, eDiscovery readiness, Compliance Manager, Purview audit readiness, sensitivity labels, data classification, records management, HIPAA, PCI, SOC 2, NIST, ISO 27001, CMMC, FTC Safeguards Rule, IRS WISP, and cyber insurance evidence support.
Security Awareness and Response
User-reported phishing workflow, attack simulation readiness, incident response procedure, compromised account playbooks, phishing triage, data exposure response, ransomware response, and executive reporting for leadership and auditors.
Office 365 security implementation process
Structured review, risk assessment, hardening, documentation, and ongoing improvement.
OC Security Audit follows a structured process to review, prioritize, harden, document, and improve your Microsoft 365 environment with practical security controls, risk-based remediation, and business-aware implementation support.
DiscoveryTenant, licenses, users, administrators, domains, DNS records, email policies, collaboration settings, and compliance requirements.
Risk AssessmentWeak MFA, excessive admin permissions, exposed mailboxes, poor DNS authentication, insecure sharing, missing logs, risky sign-ins, and weak email protection.
Identity HardeningMFA, Conditional Access, role-based permissions, least privilege, admin protection, legacy authentication blocking, and risky sign-in controls.
Email SecurityAnti-phishing, anti-spam, anti-malware, Safe Links, Safe Attachments, quarantine, spoof protection, impersonation protection, and forwarding controls.
Ongoing ReviewDocumentation, audit evidence, monitoring, user training, backup readiness, incident response procedure, and recurring improvement.
Office 365 security and compliance requirements
Compliance mapping for HIPAA, PCI DSS, SOC 2, NIST, ISO 27001, CMMC, FTC Safeguards, IRS WISP, and cyber insurance.
Microsoft 365 can store, transmit, or provide access to regulated information. The security configuration should support the compliance and cyber insurance requirements that apply to your business.
HIPAA Compliance and Office 365
- MFA enforcement and access control
- Audit logging and user activity monitoring
- Encryption, DLP for PHI, and secure email delivery
- Backup and recovery planning, incident response readiness, and Business Associate Agreement review
PCI DSS and Office 365
- Payment-related email, files, workflows, and support processes may affect PCI DSS scope
- Focus on account access, MFA, logging, email protection, password policy, data handling, and administrative access control
- Validate whether cardholder data is stored, transmitted, or discussed in Microsoft 365
Other Compliance Frameworks
- Microsoft Purview DLP can help identify and protect regulated data across Exchange, SharePoint, OneDrive, Office apps, endpoints, and other locations
- Support SOC 2, NIST Cybersecurity Framework, ISO 27001 / ISO 27002, CMMC, FTC Safeguards Rule, IRS WISP, and cyber insurance readiness
Implementation and managed IT support
From Microsoft 365 findings to secure configuration and ongoing operations.
OC Security Audit can identify the risks and define the remediation priorities. When the work requires tenant administration, hands-on configuration, ongoing user support, or managed Microsoft 365 operations, ITPerfection can help implement and operate the related technology.
Microsoft 365 Configuration Support
Implementation support for MFA, Conditional Access, Defender policies, Exchange Online settings, mailbox controls, DLP, retention, and secure collaboration.
Managed IT and Help Desk
User support, account changes, device coordination, mailbox troubleshooting, monitoring, maintenance, and practical IT follow-through after the security review.
Endpoint, Backup, and Cloud Operations
Microsoft 365 security depends on endpoint health, backup planning, identity hygiene, cloud administration, and IT operations that stay maintained after the project.
If your Microsoft 365 security roadmap requires ongoing administration, see ITPerfection Microsoft 365 managed services, Azure managed services, co-managed IT services, and proactive monitoring and maintenance.
Industries we serve
Microsoft 365 email protection for organizations with sensitive data and real business exposure.
Email security priorities change by industry, but the common theme is the same: protect identity, sensitive communication, client data, regulated records, payment workflows, and executive decision-making.
Healthcare clinics and dental offices often need Microsoft 365 controls aligned with HIPAA security readiness, ePHI protection, secure email, and access controls. CPA firms and tax preparers often need help with IRS WISP compliance, client data protection, email security, and business email compromise risk.
Law firms, real estate companies, nonprofits, manufacturers, construction companies, engineering firms, and professional services firms often need Microsoft 365 phishing protection, MFA, DLP, external sharing review, backup planning, and cyber insurance readiness.
Healthcare & Dental
Protect ePHI, patient communication, billing records, and Microsoft 365 access.
CPA & Tax Firms
Reduce account compromise risk across email, client files, tax records, and IRS WISP evidence.
Law & Real Estate
Protect confidential files, wire instructions, case data, escrow communication, and client portals.
Manufacturing & Services
Protect executive accounts, vendor communication, remote teams, and operational continuity.
Free self-assessment tools
Start with a quick Microsoft 365 and email risk check.
These free tools are for initial guidance only and do not replace a professional cybersecurity audit, compliance assessment, penetration test, or legal/compliance review.
Good starting questions
- Are all users and administrators protected by strong MFA?
- Are legacy authentication and risky sign-ins blocked?
- Are Defender policies tuned for phishing, impersonation, links, and attachments?
- Are forwarding rules, shared mailboxes, and delegated access reviewed?
- Can your team investigate a compromised mailbox quickly?
Why choose OC Security Audit
Microsoft, security, and compliance guidance from a hands-on CISO.
OC Security Audit is led by Ali Hassani, CISO, with 25+ years of real-world IT, cybersecurity, Microsoft infrastructure, Office 365/Microsoft 365 security, compliance, network security, and business technology experience.
- Microsoft 365, Exchange, identity, endpoint, network, and compliance experience
- Practical review of technical controls, not just policy language
- Local focus for Irvine, Orange County, Los Angeles County, and Southern California
- Certifications include CISSP, CCISO, MCSE, MCSA, CCNP, CCNA, MCITP, MCP, and MCTS
Microsoft 365 email security FAQ
Common questions before an email security review.
Is Microsoft 365 email security only about spam filtering?
No. Strong Microsoft 365 email security includes identity protection, MFA, Conditional Access, Defender for Office 365, Safe Links, Safe Attachments, DLP, encryption, mailbox forwarding controls, audit logging, external sharing, backup/recovery planning, and incident response readiness.
Can OC Security Audit review our Microsoft 365 tenant without taking over IT support?
Yes. OC Security Audit can provide an independent security review and remediation roadmap. If your organization also needs hands-on managed IT or Microsoft 365 administration, ITPerfection can help with implementation and ongoing support.
Does this help with cyber insurance questionnaires?
Yes. Microsoft 365 controls such as MFA, privileged access, email protection, endpoint security, logging, backups, incident response, and security awareness often appear in cyber insurance questionnaires and customer security reviews.
Do free tools replace a professional review?
No. Free tools are useful for initial guidance, but they do not replace a professional cybersecurity audit, compliance assessment, penetration test, legal review, or carrier-specific cyber insurance review.
Need stronger Microsoft 365 email security?
OC Security Audit can review your Microsoft 365 email, identity, data protection, logging, compliance, and incident readiness posture, then help prioritize the fixes that matter most for your business.