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Nanosek provides Cloudflare Email Security services for organizations defending against phishing, business email compromise, spoofing, impersonation, malicious links, malware attachments, and QR phishing. The service includes threat detection tuning, MX routing integration, policy design, mail platform alignment, deployment readiness, false-positive handling, DNS authentication alignment, visibility, reporting, and managed operations.
Who this is for
What Cloudflare Email Security helps protect
Phishing attacks
Targeted phishing campaigns try to steal credentials, redirect payments, or install malware. Cloudflare Email Security analyzes message content, links, sender behavior, and threat signals to identify and quarantine high-confidence phishing.
Business email compromise
BEC attacks impersonate executives, suppliers, or finance contacts to authorize transfers, change payment details, or access sensitive data. Nanosek configures detection policies that flag impersonation before messages reach inboxes.
Spoofing and sender impersonation
Attackers spoof domains, display names, and lookalike addresses to bypass basic filters. Cloudflare Email Security layers sender analysis, domain similarity checks, and authentication signals to catch spoofed messages.
Internal impersonation
Attackers who compromise or spoof internal accounts can attack other users from trusted sources. Detection policies need to handle internal message paths and trust relationships carefully.
Malicious links in email
URL-based attacks deliver phishing pages, credential harvesting sites, malware downloads, and drive-by exploits through links that look legitimate. Link inspection and rewriting improve post-delivery control.
Malware and malicious attachments
Attachments can carry ransomware, trojans, or macro-based malware. Deep file inspection and sandbox analysis help catch threats that evade basic antivirus engines.
QR phishing
QR codes embedded in email bypass link scanners and direct users to phishing pages from personal devices. Cloudflare Email Security can analyze QR code content in attachments and message bodies.
Vendor and third-party email compromise
Attacks through compromised suppliers or partner email accounts arrive from trusted senders. Nanosek helps tune policies that account for legitimate third-party sending patterns while flagging unusual behavior.
Graymail and lookalike campaigns
Mass phishing campaigns targeting multiple users can use URL variation, slight header changes, or lookalike domains to avoid batch detection. Policy rules need breadth as well as precision.
DNS authentication gaps
SPF, DKIM, and DMARC gaps allow spoofing and degrade email deliverability. Nanosek aligns email authentication with Cloudflare DNS management to close gaps before deploying enforcement.
Outbound email exposure
Outbound mail from compromised accounts or misconfigured systems can damage domain reputation and enable attackers. Policy visibility and monitoring help detect unusual outbound patterns.
False-positive risk and user friction
Aggressive filtering can quarantine legitimate email from finance, legal, suppliers, and executives. Deployment readiness and allow-list planning reduce operational disruption during rollout.
Shadow IT and unmanaged mail flows
Mail from SaaS platforms, marketing tools, and unmanaged sending infrastructure may not be authenticated or monitored. Discovery and DNS audit steps identify gaps before enforcement.
Visibility and alert fatigue
Email security generates high alert volumes. Nanosek helps prioritize signals, configure actionable dashboards, and build workflows that let security teams investigate efficiently.
Why email security needs careful deployment
Email security controls can quarantine legitimate mail from executives, finance teams, legal counsel, suppliers, and customers. Nanosek designs a staged rollout with threat review, allow-list planning, and user communication before enforcement changes are promoted.
Our Cloudflare Email Security approach
Discovery and mail flow inventory
- Inventory email domains, mail flow architecture, MX routing, sending infrastructure, third-party senders, SaaS platforms, and current authentication status.
- Review SPF, DKIM, DMARC, and BIMI records across all sending domains and identify gaps before enforcement begins.
Threat baseline and detection review
- Analyze current threat volume, attack types, sender patterns, phishing campaigns, BEC attempts, and historical security events.
- Review detection configuration, policy rules, quarantine thresholds, and existing allow-list or block-list entries.
Policy design and integration planning
- Design detection policies for phishing, BEC, spoofing, malicious links, attachments, and QR phishing based on risk tolerance and business context.
- Plan MX routing changes, mail platform integration, allow-list strategy, remediation workflows, and user notification approach.
Deployment and MX routing
- Configure Cloudflare Email Security detection policies, quarantine rules, allow and block lists, and response actions.
- Coordinate MX routing change with mail platform, DNS, and IT teams using a tested cutover and rollback plan.
Tuning and false-positive handling
- Review quarantine queues, release legitimate email, update allow-list and exception rules, and refine detection thresholds.
- Work with end users, IT teams, and business owners to validate that critical mail flows are unaffected by enforcement changes.
Monitoring and managed operations
- Configure dashboards, alerting, reporting, and incident workflows for ongoing email security operations.
- Provide regular threat review, policy tuning, campaign analysis, allow-list hygiene, and managed Cloudflare operations.
Architecture
Cloudflare Email Security capabilities we help operationalize
Phishing detection
Used to identify and quarantine high-confidence phishing messages based on content, links, sender signals, and threat intelligence.
BEC detection
Used to detect executive impersonation, financial fraud indicators, lookalike senders, and urgency-based social engineering patterns.
Spoofing detection
Used to analyze sender domain alignment, display name spoofing, lookalike domain detection, and header anomalies.
Malicious link inspection
Used to scan URLs in message bodies and attachments and block or rewrite links leading to phishing pages, malware, or credential harvesting sites.
Attachment scanning and sandboxing
Used to inspect file attachments for malware, macros, embedded exploits, and known and unknown threat signatures.
QR code inspection
Used to extract and analyze QR code content in attachments and message bodies to detect QR phishing payloads that bypass standard link scanners.
Vendor email compromise detection
Used to flag unusual behavior from trusted supplier or partner domains including sign-ins from new locations, atypical message content, and off-pattern sending times.
Allow lists and block lists
Used to define trusted senders, trusted domains, and explicitly blocked senders to calibrate detection sensitivity and reduce false positives.
Quarantine management
Used to hold suspected threats for review, release, or deletion while ensuring users can recover legitimate messages with low friction.
Remediation and retraction
Used to remove delivered messages from inboxes after detection or updated threat intelligence when supported by the connected mail platform.
MX routing configuration
Used to route inbound mail through Cloudflare Email Security by updating MX records with a tested cutover and rollback path.
SPF, DKIM, DMARC alignment
Used to close authentication gaps that allow spoofing and to support DMARC enforcement progression without breaking legitimate sending.
Email security dashboard
Used for operational visibility including threat volume, detection trends, quarantine rates, campaign patterns, and policy effectiveness.
Alerting and reporting
Used to notify security teams of significant threat campaigns, unusual patterns, or policy changes requiring review.
API and SIEM integration
Used to export threat events, detection data, and quarantine decisions into SIEM, SOAR, or ticketing workflows.
Cloudflare DNS integration
Used to manage MX, SPF, DKIM, and DMARC records through Cloudflare DNS for unified zone management and rapid response.
| Capability | How Nanosek uses it |
|---|---|
| Phishing detection | Used to identify and quarantine high-confidence phishing messages based on content, links, sender signals, and threat intelligence. |
| BEC detection | Used to detect executive impersonation, financial fraud indicators, lookalike senders, and urgency-based social engineering patterns. |
| Spoofing detection | Used to analyze sender domain alignment, display name spoofing, lookalike domain detection, and header anomalies. |
| Malicious link inspection | Used to scan URLs in message bodies and attachments and block or rewrite links leading to phishing pages, malware, or credential harvesting sites. |
| Attachment scanning and sandboxing | Used to inspect file attachments for malware, macros, embedded exploits, and known and unknown threat signatures. |
| QR code inspection | Used to extract and analyze QR code content in attachments and message bodies to detect QR phishing payloads that bypass standard link scanners. |
| Vendor email compromise detection | Used to flag unusual behavior from trusted supplier or partner domains including sign-ins from new locations, atypical message content, and off-pattern sending times. |
| Allow lists and block lists | Used to define trusted senders, trusted domains, and explicitly blocked senders to calibrate detection sensitivity and reduce false positives. |
| Quarantine management | Used to hold suspected threats for review, release, or deletion while ensuring users can recover legitimate messages with low friction. |
| Remediation and retraction | Used to remove delivered messages from inboxes after detection or updated threat intelligence when supported by the connected mail platform. |
| MX routing configuration | Used to route inbound mail through Cloudflare Email Security by updating MX records with a tested cutover and rollback path. |
| SPF, DKIM, DMARC alignment | Used to close authentication gaps that allow spoofing and to support DMARC enforcement progression without breaking legitimate sending. |
| Email security dashboard | Used for operational visibility including threat volume, detection trends, quarantine rates, campaign patterns, and policy effectiveness. |
| Alerting and reporting | Used to notify security teams of significant threat campaigns, unusual patterns, or policy changes requiring review. |
| API and SIEM integration | Used to export threat events, detection data, and quarantine decisions into SIEM, SOAR, or ticketing workflows. |
| Cloudflare DNS integration | Used to manage MX, SPF, DKIM, and DMARC records through Cloudflare DNS for unified zone management and rapid response. |
Email security protection by risk area
Executive email
CEO fraud, wire transfer requests, impersonation of leadership
BEC detection, display name spoofing rules, allow-list review, and response workflow for high-risk senders
Finance and accounts payable
Fraudulent invoice requests, payment redirection, supplier impersonation
BEC and spoofing detection, vendor email analysis, DMARC alignment for outbound domains
HR and payroll
Direct deposit fraud, employee data phishing, W-2 and tax form attacks
Phishing detection, quarantine for high-risk patterns, employee notification workflows
IT and security teams
Credential phishing, token theft, account takeover enabling lateral movement
Phishing and malicious link detection, aggressive quarantine for credential harvesting indicators
Legal and compliance
Document phishing, contract fraud, data theft via malicious attachments
Attachment scanning, malicious link inspection, document-type-specific detection rules
Customer service
Phishing using customer impersonation, BEC to redirect payments
Spoofing detection, allow-list calibration to preserve customer email, quarantine review workflows
Sales and account management
Supplier compromise, fake RFP emails, partner impersonation
Vendor compromise detection, lookalike domain detection, BEC policy tuning for sales flows
Shared inboxes and service accounts
Unmonitored attack surface, phishing reaching internal workflows directly
Coverage extension to service accounts, quarantine notification configuration, allow-list review
Third-party and SaaS notifications
Phishing impersonating SaaS platforms, misclassified notifications
Allow-list planning for trusted SaaS senders, authentication alignment, false-positive review
Outbound email
Domain reputation damage, outbound phishing from compromised accounts
Outbound visibility, DMARC policy enforcement, anomaly detection for unusual sending patterns
| Risk area | Common issue | Nanosek / Cloudflare approach |
|---|---|---|
| Executive email | CEO fraud, wire transfer requests, impersonation of leadership | BEC detection, display name spoofing rules, allow-list review, and response workflow for high-risk senders |
| Finance and accounts payable | Fraudulent invoice requests, payment redirection, supplier impersonation | BEC and spoofing detection, vendor email analysis, DMARC alignment for outbound domains |
| HR and payroll | Direct deposit fraud, employee data phishing, W-2 and tax form attacks | Phishing detection, quarantine for high-risk patterns, employee notification workflows |
| IT and security teams | Credential phishing, token theft, account takeover enabling lateral movement | Phishing and malicious link detection, aggressive quarantine for credential harvesting indicators |
| Legal and compliance | Document phishing, contract fraud, data theft via malicious attachments | Attachment scanning, malicious link inspection, document-type-specific detection rules |
| Customer service | Phishing using customer impersonation, BEC to redirect payments | Spoofing detection, allow-list calibration to preserve customer email, quarantine review workflows |
| Sales and account management | Supplier compromise, fake RFP emails, partner impersonation | Vendor compromise detection, lookalike domain detection, BEC policy tuning for sales flows |
| Shared inboxes and service accounts | Unmonitored attack surface, phishing reaching internal workflows directly | Coverage extension to service accounts, quarantine notification configuration, allow-list review |
| Third-party and SaaS notifications | Phishing impersonating SaaS platforms, misclassified notifications | Allow-list planning for trusted SaaS senders, authentication alignment, false-positive review |
| Outbound email | Domain reputation damage, outbound phishing from compromised accounts | Outbound visibility, DMARC policy enforcement, anomaly detection for unusual sending patterns |
Deployment steps
- 01 Inventory email domains, sending infrastructure, third-party senders, SaaS platforms, and current authentication status.
- 02 Review SPF, DKIM, and DMARC records and align DNS authentication before enforcement begins.
- 03 Design detection policies for phishing, BEC, spoofing, attachments, malicious links, and QR phishing based on risk and business context.
- 04 Configure Cloudflare Email Security policies, quarantine rules, allow and block lists, and coordinate MX routing change with a tested rollback plan.
- 05 Review quarantine queues, release legitimate email, update exceptions, and tune detection thresholds with business owner approval.
- 06 Configure dashboards, alerting, reporting, and incident workflows for managed operations and ongoing policy hygiene.
Risks and mitigations
Quarantining legitimate business email.
Build allow-list from known senders before MX cutover, review quarantine daily in the first two weeks, and maintain a fast release workflow for end users.
Disrupting inbound mail during MX change.
Plan the routing change with a tested rollback, reduce TTL ahead of time, validate delivery on a test domain first, and monitor error queues actively.
Breaking SaaS or transactional notifications.
Identify SaaS sending domains during discovery, add to allow-list before deployment, and validate delivery for critical notifications during cutover.
DMARC enforcement breaking legitimate sending.
Start at p=none, monitor reports for unknown senders, authorize sending sources, and only progress to quarantine or reject after full sender coverage is confirmed.
Missed threats during policy tuning.
Use conservative quarantine settings during the initial period rather than rely on log-only mode for high-risk categories like BEC and executive impersonation.
Alert fatigue from high detection volume.
Configure tiered alerting by threat confidence and category, and build a triage workflow that separates high-priority incidents from routine quarantine review.
Attackers adapting to detection.
Use layered detection with behavioral signals, not just pattern matching. Review campaign trends and update detection policies as attacker TTPs evolve.
Shadow sending infrastructure not covered.
Audit DMARC reports and DNS records for unknown senders, and inventory SaaS and marketing platforms before closing authentication gaps.
Vendor compromise arriving from trusted senders.
Enable vendor email compromise detection and configure alerts for anomalous behavior from known partner domains.
Governance and allow-list sprawl over time.
Review allow-list and exception entries quarterly, enforce owner and expiry documentation, and remove stale entries to reduce detection surface.
| Risk | Mitigation |
|---|---|
| Quarantining legitimate business email. | Build allow-list from known senders before MX cutover, review quarantine daily in the first two weeks, and maintain a fast release workflow for end users. |
| Disrupting inbound mail during MX change. | Plan the routing change with a tested rollback, reduce TTL ahead of time, validate delivery on a test domain first, and monitor error queues actively. |
| Breaking SaaS or transactional notifications. | Identify SaaS sending domains during discovery, add to allow-list before deployment, and validate delivery for critical notifications during cutover. |
| DMARC enforcement breaking legitimate sending. | Start at p=none, monitor reports for unknown senders, authorize sending sources, and only progress to quarantine or reject after full sender coverage is confirmed. |
| Missed threats during policy tuning. | Use conservative quarantine settings during the initial period rather than rely on log-only mode for high-risk categories like BEC and executive impersonation. |
| Alert fatigue from high detection volume. | Configure tiered alerting by threat confidence and category, and build a triage workflow that separates high-priority incidents from routine quarantine review. |
| Attackers adapting to detection. | Use layered detection with behavioral signals, not just pattern matching. Review campaign trends and update detection policies as attacker TTPs evolve. |
| Shadow sending infrastructure not covered. | Audit DMARC reports and DNS records for unknown senders, and inventory SaaS and marketing platforms before closing authentication gaps. |
| Vendor compromise arriving from trusted senders. | Enable vendor email compromise detection and configure alerts for anomalous behavior from known partner domains. |
| Governance and allow-list sprawl over time. | Review allow-list and exception entries quarterly, enforce owner and expiry documentation, and remove stale entries to reduce detection surface. |
Deployment readiness checklist
- All email domains and subdomains inventoried
- MX routing architecture documented
- Third-party senders and SaaS platforms identified
- SPF records reviewed for all sending domains
- DKIM signing configured and validated
- DMARC policy reviewed (p=none, quarantine, or reject)
- Allow-list candidates identified from business workflows
- Finance, executive, and legal mail flows mapped
- Current quarantine workflows and review process documented
- Backup MX or failover routing planned
- Cloudflare Email Security routing tested in staging or partial-flow mode
- Detection policies reviewed and thresholds set for initial rollout
- User notification and quarantine release process agreed
- IT and security escalation contacts confirmed
- Rollback plan for MX routing change prepared
- Logpush or API integration configured for SIEM workflows
- Dashboard and alerting configuration reviewed
- Business stakeholders briefed on enforcement changes
Deliverables
- Email domain and mail flow inventory
- DNS authentication audit report (SPF, DKIM, DMARC)
- Threat baseline and detection gap review
- Allow-list and exception strategy
- Email security policy design
- MX routing change plan with rollback steps
- Cloudflare Email Security configuration
- DNS authentication alignment and fixes
- Quarantine workflow and user release process
- Tuning report and false-positive resolution log
- Email security dashboard and alerting setup
- Incident response workflow for email threats
- Managed operations handover and tuning backlog
When Nanosek should help
Frequently asked questions
What is Cloudflare Email Security?
Does Cloudflare Email Security replace our existing mail platform?
How do we handle false positives?
Can Cloudflare Email Security protect against BEC if the attacker uses a legitimate account?
Do we need to change our DNS records to deploy Cloudflare Email Security?
How does DMARC relate to Cloudflare Email Security?
Can Cloudflare Email Security detect QR phishing?
What happens if the Cloudflare Email Security service is unavailable?
Can Nanosek provide ongoing managed email security operations?
Strengthen email security with Cloudflare
Nanosek helps you deploy Cloudflare Email Security with the right policy design, DNS authentication alignment, allow-list planning, and managed operations to defend against phishing, BEC, and impersonation without disrupting business email.