Senior Systems Administrator (Email Operations)

We are seeking a highly skilled Senior Systems Administrator - Email Operations to lead the reliability, security, and performance of our enterprise messaging environment. This role serves as the technical expert for Microsoft Exchange, Exchange Online, and email security platforms, ensuring high availability, secure message flow, and compliance across the organization. The ideal candidate excels at troubleshooting complex messaging issues and driving operational excellence in hybrid and cloudbased environments.

Key Responsibilities

Messaging Platform Administration

Lead daily operations of enterprise email systems (Exchange, Exchange Online, Microsoft 365).
• Monitor service availability, performance, message queues, and mail flow.
• Support hybrid Exchange environments, directory synchronization, and identity integration.

Troubleshooting & Advanced Support

• Diagnose and resolve complex email delivery, routing, and authentication issues.
• Provide tier3 support and serve as the escalation point for messagingrelated incidents.
• Perform rootcause analysis and implement longterm corrective actions.

Email Security & Compliance

• Administer email security solutions (spam/malware filtering, phishing protection, message encryption).
• Manage policies for retention, archiving, journaling, and regulatory compliance.
• Implement and maintain SPF, DKIM, DMARC, and other authentication standards.

Operations, Maintenance & Lifecycle Management

• Perform upgrades, patches, and configuration changes following change management processes.
• Maintain operational documentation, runbooks, and disaster recovery procedures.
• Ensure high availability and resilience of messaging infrastructure.

Collaboration & Continuous Improvement

• Work closely with security, networking, and service desk teams to improve reliability and user experience.
• Mentor junior administrators and contribute to knowledge sharing across the team.
• Recommend enhancements to messaging architecture, security posture, and operational workflows.

Required Qualifications

• Bachelor's degree in IT or a related field, and 8 years of experience. 4 years of additional experience may be substituted in lieu of a degree.
• 5 years administering enterprise email systems.
• Strong handson experience with Microsoft Exchange and/or Exchange Online.
• Deep understanding of SMTP, DNS (MX, SPF, DKIM, DMARC), and email authentication protocols.
• Experience with email security gateways and compliance tools.
• DoD 8140 IAT Level II certification (e.g., Security+).
• Active TS/SCI clearance.

Preferred Qualifications

• Microsoft certifications (Exchange, Microsoft 365, Security).
• Experience with advanced message hygiene platforms (e.g., Proofpoint, Mimecast, Microsoft Defender for Office 365).
• Familiarity with Zero Trust messaging security models.

Peraton is a next-generation national security company that drives missions of consequence spanning the globe and extending to the farthest reaches of the galaxy. As the world's leading mission capability integrator and transformative enterprise IT provider, we deliver trusted, highly differentiated solutions and technologies to protect our nation and allies. Peraton operates at the critical nexus between traditional and nontraditional threats across all domains: land, sea, space, air, and cyberspace. The company serves as a valued partner to essential government agencies and supports every branch of the U.S. armed forces. Each day, our employees do the can't be done by solving the most daunting challenges facing our customers. Visit peraton.com to learn how we're keeping people around the world safe and secure.