Microsoft 365 email security that stops business email compromise.
A CISO-led review of Exchange Online, Defender for Office 365, mailbox rules, identity and DMARC, so a phished password never becomes a wired payment.
Tune the phishing protection you already pay for.
Anti-phishing, impersonation protection, Safe Links, Safe Attachments and quarantine, reviewed against your licenses and the people attackers actually target.
Make your domain hard to impersonate.
We validate SPF, DKIM and DMARC enforcement, third-party senders and look-alike domains, so spoofed invoices don’t reach your clients.
One compromised mailbox can open the whole tenant.
Attackers target Microsoft 365 because a single mailbox leads to OneDrive files, SharePoint content, Teams chats, vendor conversations, payment workflows and password-reset paths. Default settings are rarely enough for Orange County and Southern California firms with regulated data, cyber insurance requirements or executives who approve payments.
Microsoft 365 email security isn’t only spam filtering. We review identity, mailbox rules, Defender for Office 365 policies, domain authentication, logging and recovery together, because that’s how attackers see your tenant.
Six areas of Microsoft 365 email security, reviewed together.
Select an area to see what we check. Every review is read-only; nothing changes in your tenant.
Anti-phishing & BEC protection
We check how well Exchange Online and Defender for Office 365 stop impersonation, malicious links and the quiet mailbox changes attackers make after a login.
- Impersonation protection for executives and finance
- External sender warnings
- Suspicious inbox and forwarding rules
- Safe Links and Safe Attachments coverage
- Quarantine and user-reported phishing workflow
- Risky sign-in patterns
Identity & Conditional Access
Most mailbox compromises start with a stolen password. We confirm the Microsoft Entra ID controls that make a stolen password useless.
- MFA enforced for every user and admin
- Phishing-resistant MFA for administrators
- Legacy authentication blocked
- Risky users and risky sign-ins
- Device compliance and location policies
- Session controls and break-glass exclusions
DNS & email authentication
Your domain’s DNS records decide whether someone else can send email that looks like it came from you.
- SPF, DKIM and DMARC enforcement and reporting
- Third-party senders and marketing platforms
- Copier, scanner and web-form SMTP senders
- Look-alike domain exposure
- MX, Autodiscover and subdomain protection
- Mail flow rules, connectors and transport settings
DLP, encryption & data protection
Sensitive data leaves by email every day. We review how Microsoft Purview detects it, encrypts it and limits sharing.
- Purview DLP for PHI, cardholder data and SSNs
- Sensitivity labels and policy tips
- Microsoft Purview Message Encryption
- Do Not Forward and external recipient rules
- Retention policies
- External sharing restrictions
Logging & incident readiness
When a mailbox is compromised, the first question is what the attacker saw. Logging decides whether you can answer it.
- Unified audit log status and retention
- Mailbox audit logging
- Alerts for forwarding rules and impossible travel
- Compromised-account response playbook
- Investigation workflow and evidence preservation
- Executive reporting
Compliance & cyber insurance
We map your Microsoft 365 email controls to the frameworks and questionnaires your business has to answer.
- HIPAA safeguards for ePHI in email
- IRS WISP for tax and accounting firms
- SOC 2, NIST CSF and PCI DSS mapping
- Customer security reviews
- Cyber insurance questionnaire evidence
- Business Associate Agreement review
Email security findings written for leadership and IT.
Find the gaps, rank the risk, get a roadmap.
Email security is part of our Microsoft 365 Security Audit: 200 read-only checks, an executive report, a technical report, a risk register and a remediation roadmap.
Need the fixes done for you?
ITPerfection handles configuration and day-to-day operations: MFA and Conditional Access, Defender policies, Exchange Online settings, DLP, retention, help desk and backup.
From discovery to a hardened Microsoft 365 tenant.
- STEP 1DiscoveryTenant, licenses, users, admins, domains, DNS records, email policies and compliance requirements.
- STEP 2Risk assessmentWeak MFA, excessive admin rights, exposed mailboxes, DNS gaps, insecure sharing and missing logs.
- STEP 3Identity hardeningMFA, Conditional Access, least privilege, admin protection and legacy authentication blocking.
- STEP 4Email securityAnti-phishing, Safe Links, Safe Attachments, quarantine, spoof and impersonation protection, forwarding controls.
- STEP 5Ongoing reviewDocumentation, audit evidence, monitoring, user training, backup readiness and incident response.
Built for firms that move money and sensitive data by email.
Healthcare & dental
Protect ePHI, patient communication, billing records and Microsoft 365 access.
HIPAA security readiness →
CPA & tax firms
Reduce account-compromise risk across email, client files, tax records and IRS WISP evidence.
IRS WISP compliance →
Law & real estate
Protect confidential files, wire instructions, escrow communication and client portals.
BEC payment-verification playbook →
Manufacturing & services
Protect executive accounts, vendor communication, remote teams and operational continuity.
Microsoft 365 audit →Start with a quick Microsoft 365 and email risk check.
Initial guidance only. Free tools don’t replace a professional audit, compliance assessment or penetration test.
Microsoft, security and compliance guidance from a hands-on CISO.
Led by Ali Hassani, CISO, with 25+ years of IT, cybersecurity, Microsoft infrastructure, Microsoft 365 security and compliance experience. We review the actual technical controls, not just policy language, for businesses across Irvine, Orange County, Los Angeles County and Southern California, and remotely nationwide.
Microsoft 365 email security questions
Is Microsoft 365 email security only about spam filtering?
No. Strong email security covers identity protection, MFA, Conditional Access, Defender for Office 365, Safe Links and Safe Attachments, DLP, encryption, mailbox forwarding controls, audit logging, external sharing, backup and incident response readiness.
Can you review our tenant without taking over IT support?
Yes. OC Security Audit provides an independent, read-only review and a remediation roadmap. If you want hands-on administration, ITPerfection can implement the fixes and support ongoing operations.
Does this help with cyber insurance questionnaires?
Yes. MFA, privileged access, email protection, endpoint security, logging, backups, incident response and security awareness appear on most cyber insurance questionnaires and customer security reviews.
Do the free tools replace a professional review?
No. The free tools give initial guidance only. They don’t replace a professional cybersecurity audit, compliance assessment, penetration test, legal review or a carrier-specific insurance review.
Need stronger Microsoft 365 email security?
We review your email, identity, data protection, logging and incident readiness, then prioritize the fixes that matter most for your business.