Description

This curriculum spans the equivalent depth and breadth of a multi-workshop advisory engagement, covering the full lifecycle of email security governance, technical controls, and human factors as they apply to healthcare organizations operating under ISO 27799.

Module 1: Aligning Email Security with ISO 27799 Control Objectives

Select which ISO 27799 controls directly apply to email systems, such as A.12.6 (Technical Vulnerability Management) and A.13.2 (Information Transfer Agreements), based on organizational risk appetite.
Map email-specific risks (e.g., phishing, data leakage) to relevant control clauses in ISO 27799 to justify security investments during audit reviews.
Define the scope of email systems covered under the standard, including on-premises, cloud-hosted, and mobile endpoints.
Establish criteria for determining when email-related incidents require reporting under A.16.1 (Information Security Incident Management).
Integrate email security requirements into business continuity planning per A.17.2, particularly for healthcare messaging dependencies.
Document exceptions to control implementation with formal risk acceptance processes tied to senior management approval.
Coordinate with legal and compliance teams to ensure email retention and handling meet both ISO 27799 and jurisdictional healthcare privacy laws.
Conduct control effectiveness reviews for email encryption and access controls during internal audits aligned with A.18.2.

Module 2: Risk Assessment and Threat Modeling for Healthcare Email

Identify threat actors targeting healthcare email, including cybercriminals, insider threats, and third-party vendors with email access.
Perform threat modeling using STRIDE to evaluate spoofing, tampering, and repudiation risks in email message flows.
Quantify the impact of unauthorized email access to protected health information (PHI) using likelihood and consequence matrices.
Assess risks introduced by email integrations with EHR systems and clinical messaging platforms.
Document risk treatment plans for high-severity scenarios, such as business email compromise (BEC) targeting finance departments.
Update risk registers quarterly to reflect new email-based attack vectors like QR code phishing (quishing).
Validate risk assumptions through red team exercises simulating targeted spear-phishing campaigns.
Define thresholds for escalating email-related risks to the information security steering committee.

Module 3: Secure Email Architecture and System Design

Choose between on-premises, hybrid, or cloud email architectures based on data residency requirements and control ownership.
Design email routing to enforce TLS encryption in transit between internal and external healthcare partners.
Implement segregated email environments for clinical versus administrative staff based on data sensitivity.
Configure message hygiene layers (antispam, antivirus, URL rewriting) with minimal false positive rates for clinical communications.
Integrate secure email gateways (SEGs) with SIEM systems for centralized log correlation and anomaly detection.
Architect fallback mechanisms for encrypted email delivery when recipient systems lack compatible decryption capabilities.
Enforce DNS-based email authentication (SPF, DKIM, DMARC) with p=reject policies for domains handling PHI.
Design mailbox quotas and archiving policies to prevent denial-of-service via mailbox flooding.

Module 4: Access Control and Identity Management for Email Systems

Enforce multi-factor authentication (MFA) for all email access, including mobile and third-party client applications.
Implement role-based access controls (RBAC) to restrict shared mailbox access to authorized clinical and administrative roles.
Automate deprovisioning of email accounts upon employee termination or role change using HR system integrations.
Define break-glass access procedures for email during emergencies with audit trail requirements.
Limit forwarding rules and mail flow connectors to prevent unauthorized data exfiltration.
Monitor and alert on anomalous access patterns, such as logins from unusual geographies or after hours.
Enforce conditional access policies that block email access from unmanaged or non-compliant devices.
Review privileged administrative access to email systems quarterly with justification documentation.

Module 5: Encryption and Data Protection for Email Content

Select appropriate encryption methods (S/MIME, PGP, or provider-based encryption) based on recipient interoperability needs.
Implement automatic encryption for emails containing keywords or patterns indicative of PHI.
Configure secure email portals for external recipients who cannot receive encrypted messages natively.
Manage encryption key lifecycle, including escrow and recovery processes for legal discovery.
Define user training requirements for recognizing encrypted email indicators and handling decryption failures.
Balance usability and security by minimizing user interaction required to send encrypted messages.
Validate end-to-end encryption coverage across webmail, mobile, and desktop clients.
Document data loss prevention (DLP) policies that trigger encryption based on content analysis.

Module 6: Secure Handling of Attachments and Embedded Content

Block executable file types (e.g., .exe, .js) in email attachments by default with exceptions requiring administrative approval.
Implement dynamic attachment analysis using sandboxing to detect zero-day malware in documents.
Strip or rewrite hyperlinks in emails to route through secure web gateways for real-time URL scanning.
Enforce password protection requirements for attachments containing sensitive healthcare data.
Scan embedded objects in Office documents (e.g., OLE) for malicious payloads during email processing.
Apply content disarm and reconstruction (CDR) to sanitize PDFs and Office files before delivery.
Define policies for handling scanned patient documents sent via email, including watermarking and retention.
Monitor user behavior for repeated attempts to bypass attachment filtering mechanisms.

Module 7: Incident Response and Forensic Readiness for Email Breaches

Define email-specific incident playbooks for scenarios like credential theft, BEC, and mass phishing.
Preserve email headers, logs, and message copies in a forensically sound manner during investigations.
Establish procedures for rapid message recall or deletion across distributed email systems.
Coordinate with legal counsel on notification timelines when PHI is exposed via email.
Conduct post-incident reviews to identify control gaps in email defenses and update configurations.
Integrate email logs into SOAR platforms to automate containment actions during active threats.
Validate backup integrity for email data to support restoration after ransomware encryption.
Train help desk staff to recognize and escalate potential email compromise reports from users.

Module 8: Third-Party and Inter-Organizational Email Security

Negotiate information transfer agreements (ITAs) with partner organizations that define email security expectations.
Verify third-party vendors' email security controls through audits or standardized questionnaires.
Implement domain-based message authentication for all affiliated healthcare providers in a trust network.
Restrict email sharing with external domains not meeting minimum security baselines (e.g., no TLS enforcement).
Monitor and log all email traffic exchanged with business partners for compliance and anomaly detection.
Enforce encryption for emails sent to external recipients handling patient referrals or test results.
Establish secure email relay configurations for laboratories and imaging centers with limited IT resources.
Review third-party access to shared mailboxes or distribution lists on a quarterly basis.

Module 9: Monitoring, Logging, and Audit Compliance

Define log retention periods for email activity that satisfy both ISO 27799 and regulatory requirements (e.g., HIPAA).
Aggregate email gateway, directory service, and endpoint logs into a centralized logging platform.
Configure alerts for bulk email downloads, rule changes, or forwarding configurations indicating compromise.
Conduct quarterly access reviews of privileged email administrator accounts with documented approvals.
Perform independent audits of email security controls with evidence collection from logs and configurations.
Validate that logging mechanisms cannot be tampered with by standard users or compromised accounts.
Use UEBA tools to detect insider threats based on anomalous email sending patterns.
Produce audit-ready reports demonstrating compliance with ISO 27799 control objectives for email systems.

Module 10: User Awareness and Behavioral Governance

Develop role-specific email security training for clinical staff emphasizing patient confidentiality.
Simulate phishing attacks with healthcare-themed lures to measure user susceptibility and reinforce training.
Implement just-in-time warnings when users attempt to send emails with sensitive content or external recipients.
Establish clear policies for using personal email for work-related communications with disciplinary consequences.
Track user compliance with secure email practices through metrics like encryption usage and reporting rates.
Integrate email security reminders into onboarding and annual compliance training cycles.
Design feedback mechanisms for users to report false positives in spam or encryption systems.
Engage department leaders to model secure email behaviors and reinforce organizational norms.