Email Security Engineer

Job Description:

DXC Technology helps global companies run their mission-critical systems and operations while modernizing IT, optimizing data architectures, and ensuring security and scalability across public, private and hybrid clouds. The world's largest companies and public sector organizations trust DXC to deploy services to drive new levels of performance, competitiveness, and customer experience across their IT estates.

Job Summary:
We are seeking a highly skilled Email Security Engineer with hands-on experience in managing and optimizing enterprise-grade email security platforms. This role is instrumental in safeguarding users against email-based threats, enforcing domain authentication standards, and maintaining the integrity of cloud and on-premises messaging systems.

The engineer will work closely with vendors such as Valimail, Proofpoint, and Trend Micro, and will be actively involved in policy enforcement, incident response, system governance, and compliance readiness.

Key Responsibilities:

• Investigate and respond to malicious email threats, phishing campaigns, spoofing incidents, and business email compromise (BEC).

• Administer and enhance configurations on email security platforms including Valimail, Proofpoint, and Trend Micro.

• Manage and enforce DMARC, SPF, and DKIM protocols using Valimail to ensure domain protection and message authenticity.

• Perform daily and monthly system health checks, reviewing traffic patterns, threat categorizations, and delivery performance.

• Coordinate with vendors and Technical Account Managers (TAMs) for feature rollouts, issue resolution, and governance activities.

• Implement and monitor email routing rules, spam filtering, policy enforcement, and reputation-based controls.

• Troubleshoot delivery failures, analyze Non-Delivery Reports (NDRs), and liaise with internal teams for root cause resolution.

• Maintain integration between Microsoft Exchange (on-prem/hybrid) and Office 365 environments.

• Provide support for internal and external audits, including data collection, compliance reporting, and evidence submission.

• Manage blocklists, allowlists, quarantine settings, and warning banners in user-facing messages.

• Conduct quarterly access reviews and ensure governance policies are consistently applied across platforms.

Role Expectations:

• Applies deep subject matter expertise in email authentication, security protocols, and threat prevention.

• Develops and enhances detection methods, policy frameworks, and threat mitigation strategies.

• Solves complex issues involving message headers, routing paths, and authentication anomalies.

• Makes independent decisions within policy guidelines to maintain secure and reliable mail flow.

• Leads or contributes to cross-functional initiatives involving IT, cybersecurity, and compliance teams.

• Mentors junior team members and contributes to documentation, process refinement, and knowledge sharing.

• Represents the organization in vendor meetings and discussions with clients or auditors regarding email security posture.

Technical Skills and Experience Required:

Essential:

• 3–5 years of experience in managing enterprise email security platforms.

• Strong understanding of email protocols (SMTP, IMAP, POP3), DNS, and general networking concepts.

Experience in at least 2 of the following technologies:

• Valimail – DMARC, SPF, DKIM configuration and enforcement

• Proofpoint Email Protection

• Trend Micro Email Security

• Microsoft Exchange (on-prem/hybrid)

• Microsoft 365 / Office 365

• Email auditing and hygiene

• Email routing and delivery troubleshooting

• ITSM integration for incident and workflow tracking

Advantageous Certifications:

• Microsoft 365 Security Administrator, SC-200, SC-400

• CompTIA Security+

• Vendor-specific email security credentials (e.g., Proofpoint, Valimail)

Learn more about DXC's Security team - Security

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