M365 & Google Workspace Security

Secure Your Business Communications Against Modern Email Threats

Email remains the most exploited attack vector in modern cybersecurity. More than 90% of successful cyberattacks begin with an email, making phishing, ransomware delivery, credential theft, and Business Email Compromise (BEC) among the most significant risks facing organizations today.

Attackers continuously target employees, executives, finance teams, HR departments, and IT administrators through sophisticated phishing campaigns, malicious attachments, fake invoices, credential harvesting pages, and domain impersonation.

NuageSec's Email Security Assessment Services help organizations identify weaknesses across Microsoft 365, Google Workspace, Exchange Online, Secure Email Gateways, email authentication protocols, user awareness, and security configurations to reduce the risk of email-based cyberattacks.

Securing Corporate Communications For
SPF Alignment
DKIM Key Rotation
DMARC Enforcement
Microsoft 365
Google Workspace
Phishing Sandboxing
BEC Display Filters
DLP outbound checks
Secure Email Gateway
TLS Mail Encryption
SPF Alignment
DKIM Key Rotation
DMARC Enforcement
Microsoft 365
Google Workspace
Phishing Sandboxing
BEC Display Filters
DLP outbound checks
Secure Email Gateway
TLS Mail Encryption

What is an Email Security Assessment?

An Email Security Assessment is a comprehensive evaluation of your organization's email infrastructure, authentication mechanisms, mail flow security, user protection controls, and monitoring capabilities.

The assessment identifies vulnerabilities that attackers commonly exploit to deliver phishing emails, compromise user accounts, spoof trusted domains, distribute malware, and bypass email security controls.

Why Email Security Assessments Matter

Email continues to be the preferred attack vector because it directly targets people rather than technology.

Prevent Phishing Attacks

Strengthen email filtering, impersonation protection, and user safeguards to reduce phishing-related incidents.

Reduce Business Email Compromise

Protect executive accounts, finance teams, vendors, and business communications against fraudulent email attacks.

Protect Brand Reputation

Prevent attackers from spoofing your organization's domain to target customers, suppliers, and employees.

Improve Identity Security

Strengthen authentication controls to reduce credential theft and account compromise.

Secure Sensitive Information

Protect confidential communications through encryption, data loss prevention, and secure email policies.

Support Compliance

Meet regulatory requirements for secure electronic communications, email retention, auditing, and information protection.

Common Email Security Risks We Assess

Our assessment identifies weaknesses across enterprise mailboxes, identity configurations, routing, and user reporting:

Phishing Protection

  • Safe Links configuration checks
  • Safe Attachments bypass risk
  • Sandbox configurations review
  • Phishing report button auditing

Business Email Compromise

  • Display name spoofing filters
  • Executive accounts protections
  • Domain impersonation blocking
  • Vendor payment controls review

SPF, DKIM & DMARC

  • DMARC reject policies audits
  • DKIM selector validation checks
  • SPF lookup limit evaluations
  • Email routing alignment checks

Microsoft 365 Security

  • Defender for Office 365 rules
  • Exchange mail flow rules check
  • Conditional Access requirements
  • Shared mailbox log audits

Google Workspace Security

  • Gmail routing setups check
  • Google Vault retention check
  • Advanced protection compliance
  • Third-party application filters

Email Encryption

  • Inbound/Outbound TLS audits
  • Message encryption configuration
  • Certificate validation reviews
  • Secure file transfers checks

Email Penetration Testing vs Email Security Assessment

While email penetration testing evaluates active exploit entry paths, our assessment evaluates complete configuration parameters and policy controls.

FeatureEmail Penetration TestingEmail Security Assessment
Primary ObjectiveSimulates active email threats and attacksEvaluates overall email configurations and security posture
Evaluation FocusOffensive execution and threat delivery pathsDefensive policies, identity controls, and DNS records
Assessment ScopeTargeted to test individual routing pointsComprehensive analysis covering people, processes, and tech
Core OutcomeIdentifies exploitable vulnerability bypassesDelivers long-term configuration hardening roadmaps
Analysis StyleTechnical execution checks (e.g. spoof deliveries)Strategic configuration review and alignment checks

Types of Email Security Assessment Services

NuageSec evaluates traditional mail routing, DNS authentication, and secure email gateway policies.

Microsoft 365 Email Security Assessment

Securing Microsoft 365 Messaging Services

Evaluate Defender for Office 365, Exchange Online Protection, anti-phishing policies, mail flow rules, and Conditional Access setup.

Best Suited For
  • M365 Tenant optimization
  • Exchange Online migrations
  • Shared mailbox auditing
Key Coverage Areas
  • Safe Links configurations
  • Exchange administrative roles
  • Defender anti-phishing checks
  • MFA validation checks

Google Workspace Security Assessment

Securing Gmail & Google Workspace

Assess Google Workspace administrative controls, Advanced Protection setups, Google Vault configurations, Gmail routing rules, and sharing policies.

Best Suited For
  • Google Workspace audits
  • Gmail routing optimization
  • Admin configurations check
Key Coverage Areas
  • Gmail routing rules audit
  • Advanced Protection check
  • Google Vault review
  • Context-Aware Access validation

SPF, DKIM & DMARC Assessment

Protecting Your Domain from Spoofing

Analyze DNS SPF include statements, DKIM selectors, and DMARC enforcement configurations to verify domain authenticity and block email spoofing.

Best Suited For
  • Domain authentication audits
  • Deliverability optimizations
  • Brand abuse protections
Key Coverage Areas
  • SPF lookup limits checks
  • DKIM key rotation audits
  • DMARC reject status check
  • Domain alignment validation

In-Depth Mailbox Audits

We perform rigorous validations on Secure Gateways, display names, forwarding rules, and user awareness metrics.

Secure Email Gateway (SEG)

We analyze spam filters, sandbox settings, and threat feeds across Mimecast, Proofpoint, or Barracuda.

Malware sandbox settingsURL rewriting checksThreat feed configurationsOutbound mail filter rulesQuarantine workflow reviewsAttachment blocking checksReputation lookup validationGateway integration review

Business Email Compromise (BEC)

Evaluate your technical safeguards against domain impersonation, display name fraud, and vendor payment trickery.

Display name spoofing rulesExecutive protection policiesInternal mail flow validationAuto-forwarding rules auditsHigh-risk user profiling checkInbound header verificationImpersonation threshold checksFraud warning banners check

Email Encryption & DLP

Verify TLS mail routes, message classifications, and outbound content screening filters.

TLS connection enforcementMessage encryption checksS/MIME setups verificationDLP content keyword filtersSensitive data types blockingOutbound file control reviewsDLP alert dispatch auditingEmail retention rules review

Monitoring & Human Readiness

Evaluate SIEM integrations, mail log configurations, and phishing simulation effectiveness.

Exchange/Gmail log shippingMailbox activity auditsAlert severity configurationIncident report mechanism checkSecurity awareness alignmentFinance team phish testingPhishing simulation metricsIncident Response playbooks

Our Email Security Assessment Methodology

NuageSec follows a structured methodology aligned with NIST SP 800-45 and Zero Trust principles.

1
1. Discovery & Scope Review
Catalog email routes, identify cloud tenants (M365/Google), and map DNS configurations.
2
2. Configuration Analysis
Audit tenant mail configurations, secure gateway rule databases, and administrator permissions.
3
3. Security Validation
Verify anti-phishing rules, Safe Links, attachment sandboxing, and outbound routing settings.
4
4. Domain Authentication Audit
Scan SPF lookups, trace DKIM selectors, and check DMARC alignment status.
5
5. Risk & Compromise Analysis
Identify forwarding rules, trace internal spoofing gaps, and spot insecure shared mailboxes.
6
6. Risk Prioritization
Grade findings according to exploitability, deliverability impact, and business value.
7
7. Reporting & Roadmap
Deliver strategic reports, technical GPO guides, scorecards, and SPF/DMARC health logs.

Email Security Standards & Frameworks

Our Email Security Assessment methodology aligns with globally recognized messaging security standards.

Email Security Standards

NIST SP 800-45 Electronic Mail SecurityMicrosoft 365 Security Best PracticesGoogle Workspace Security Best PracticesCIS Microsoft 365 Foundations BenchmarkCIS Controls for Messaging PlatformsOWASP Top 10 Mail Safeguards

Compliance Standards

MITRE ATT&CK Email Attack VectorsMITRE D3FEND Countermeasures MapSOC 2 Trust Services CriteriaPCI DSS Communications Security RulesHIPAA, GDPR, DORA & NIS2 Framework Rules

What You Receive with Our Email Security Assessments

We deliver executive overviews alongside SPF/DKIM/DMARC health logs, scorecards, and prioritized GPO plans.

Executive Email Security Report

A business-focused summary describing email protection scores, compliance readiness, and strategic investments.

Includes:
  • Executive Posture summary
  • Compliance readiness overview
  • Top email security concerns
  • Tenant/Gateway performance score
  • Maturity progression recommendations
  • Investment roadmap suggestion

Technical Assessment Report

Detailed documentation detailing findings across core mail routing, tenant rules, and filtering configurations.

Includes:
  • Mail routing inventory registry
  • Exchange/Workspace configurations
  • Anti-phishing policies log
  • Secure Gateway rules review
  • Vulnerability findings details
  • Remediation implementation steps

Email Security Scorecard

A structured scorecard ranking email security controls against Microsoft, Google, and CIS baselines.

Includes:
  • Email Authentication score
  • Phishing Protection effectiveness
  • BEC Safeguards index value
  • DLP rules compliance rating
  • Identity/MFA security rating
  • Monitoring & Logging readiness

Email Risk Matrix

A visual matrix prioritizing identified email risks by severity, likelihood, and location.

Includes:
  • Likelihood vs Impact ranking
  • High-risk user vulnerability lists
  • Device risk calculations
  • Mitigating control listings
  • Residual mailbox risk levels

SPF, DKIM & DMARC Report

Detailed DNS verification logs, alignment checks, and deliverability impact metrics.

Includes:
  • SPF DNS registry validation
  • DKIM selector validation check
  • DMARC policy enforcement status
  • Include limits verification
  • Domain spoofing risks logs
  • Deliverability impact overview

Email Security Roadmap

A step-by-step roadmap outlining tenant rule changes, SPF fixes, and gateway optimization steps.

Includes:
  • SPF include list cleanup
  • DKIM selector configuration
  • DMARC policy staging plan
  • Safe Links/Safe Attachments fixes
  • DLP keyword configurations
  • Continuous monitoring metrics

Industries We Serve

Every industry depends on secure business communications. Our assessments are tailored to sector risks.

Banking & Financial Services

Secure transaction approval emails, corporate financial transfers, and customer statements routing.

Healthcare

Secure patient emails, appointment reminders, EHR data transfers, and maintain HIPAA compliance.

SaaS & Technology

Protect cloud workspace logins, administrative developer accounts, and DevOps notifications.

Manufacturing

Secure partner invoice communications, shipping records, and procurement department emails.

Retail & Ecommerce

Protect payment verification mails, support desk tickets routing, and customer campaign lists.

Logistics & Supply Chain

Secure dispatch communications, customs clearance emails, and warehouse operations alerts.

Compliance Frameworks Supported

Email security is a key requirement across many cybersecurity and data protection regulations.

SOC 2

Validate security, availability, and confidentiality trust principles.

ISO 27001

Align with international information security management standards.

PCI DSS

Protect cardholder data and payment infrastructure.

HIPAA

Secure patient portals and protected health information (PHI).

GDPR

Ensure compliance with European data privacy and security regulations.

DORA

Enhance digital operational resilience for financial entities.

NIS2

Meet cybersecurity requirements for essential European services.

CMMC

Validate controls required for defense industrial base contractors.

ISO 42001

Establish secure and trustworthy AI application governance.

Why Choose NuageSec for Email Security Assessments?

Effective email security requires more than deploying spam filters. We validate actual safeguards.

M365 & Google Workspace Expertise

Our consultants have extensive experience securing Microsoft 365, Exchange Online, Google Workspace, and hybrid environments.

Comprehensive Validation

We assess authentication protocols, mail flow, phishing protection, email gateways, encryption, and data loss prevention.

Risk-Based Recommendations

Every recommendation is prioritized according to business impact, likelihood of exploitation, and operational importance.

Executive & Technical Reporting

High-level security scorecards and risk matrices are delivered alongside detailed GPO settings and DNS logs.

Standards-Based Methodology

Our assessments align with NIST guidance, Microsoft Security Best Practices, Google Workspace Best Practices, and CIS Controls.

Continuous Security Improvement

We partner to optimize gateways, coordinate SPF/DKIM workshops, tune DMARC rules, and verify compliance controls.

Our Engagement Process

We follow a structured 7-step process to ensure comprehensive email visibility and measurable security improvements.

Step 1

Discovery & Scoping

Audit email routing infrastructure, identify M365/Google Workspace setups, and align objectives.

Step 2

Email Security Review

Verify authentication protocols, inspect secure gateways settings, and check permissions.

Step 3

Security Validation

Audit spam configuration settings, sandboxing features, and anti-phishing filters.

Step 4

Risk & Flow Analysis

Evaluate mailbox rules, trace routing alignment, and identify configuration gaps.

Step 5

Reporting & Scorecard

Deliver executive overviews, technical reports, DNS logs, and prioritized roadmaps.

Step 6

Remediation Workshop

Discuss results, prioritize actions, and plan SPF/DKIM/DMARC configurations updates.

Step 7

Reassessment validation

Verify updated tenant settings, re-audit DNS align, and update dashboard views.

Frequently Asked Questions

An Email Security Assessment evaluates your organization's email environment, authentication protocols, mail flow, phishing protection, email gateways, identity controls, and monitoring capabilities to identify security weaknesses and reduce email-based cyber risks.

Yes. We assess Microsoft 365, Exchange Online, Microsoft Defender for Office 365, Google Workspace, Gmail security, and hybrid email environments.

SPF, DKIM, and DMARC help prevent attackers from spoofing your organization's domain, improve email authenticity, protect your brand reputation, and increase email deliverability.

Yes. We evaluate executive protection, mailbox security, authentication controls, domain impersonation protection, mail forwarding rules, and phishing defenses to reduce the risk of Business Email Compromise attacks.

Yes. We review anti-phishing policies, anti-spam controls, Safe Links, Safe Attachments, URL filtering, attachment protection, and user reporting mechanisms.

Yes. Our Email Security Assessment supports ISO 27001, SOC 2, PCI DSS, HIPAA, GDPR, DORA, NIS2, CMMC, and other regulatory frameworks requiring secure electronic communications.

You will receive an Executive Email Security Report, Technical Assessment Report, Email Security Scorecard, Email Risk Matrix, SPF/DKIM/DMARC Health Report, Email Security Maturity Assessment, and a prioritized Email Security Improvement Roadmap.

NuageSec combines deep expertise in Microsoft 365, Google Workspace, email authentication, phishing protection, identity security, internationally recognized assessment methodologies, and practical remediation guidance to help organizations strengthen email security and reduce cyber risk.

Secure Every Email. Protect Every Conversation

Email remains the primary entry point for phishing, ransomware, and Business Email Compromise attacks. A proactive Email Security Assessment helps identify weaknesses before attackers exploit them, strengthening communication security, protecting users, and reducing organizational risk.

NuageSec's Email Security Assessment Services provide the expertise, visibility, and actionable recommendations needed to secure business communications, improve email authentication, and strengthen enterprise cyber resilience.

WhatsApp