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# Microsoft Exchange Administrator

- **Company:** Leidos, Inc.
- **Location:** Alexandria, VA, United States
- **Experience:** Expert
- **Salary:** $125,000 - $155,000
- **Contract:** Permanent contract
- **Skills:** Computer-Aided Design, Microsoft Windows, Systems Engineering, Digital Architecture, Domainkeys Identified Mail, Domain-Based Message Authentication Reporting and Conformance (DMARC), Microsoft Exchange Server, Identity and Access Management, Enterprise Messaging Systems, Azure Active Directory, Shell Script, Office365, System Availability, Sender Policy Framework (SPF), Performance Monitor
- **Published:** November 2, 2026
- **Apply:** https://find.jobs/jobs-near-me/apply/ats-redirect/?id=3044132620-2

## About the Role

* Microsoft Exchange Server administration
 * Microsoft 365 / Exchange Online
 * Power
 * Shell scripting
 * Mail flow and transport rules
 * Security, compliance, and retention policies
 * Hybrid Exchange configurations
 * Backup and disaster recovery for messaging systems
 * Identity and access management (AD/Azure AD)
 * Performance monitoring and troubleshooting
 * Network and email security standards (TLS, SPF, DKIM, DMARC)

## Description

Leidos is seeking a Senior Exchange Administrator to lead the design, operation, and optimization of our Microsoft Exchange and O365 messaging environments that support mission-critical government and commercial customers. In this role, you will architect and maintain secure, highly available mail systems; manage mail flow, compliance, and retention; and resolve complex issues as a Tier III expert. You will collaborate closely with cybersecurity, network, and systems engineering teams in a mission-driven, highly collaborative culture that values integrity, innovation, diversity, and continuous learning. Leidos offers competitive pay, robust benefits, flexible work options, and opportunities to work on impactful, real-world projects in national security, health, and engineering., * Design, configure, and maintain Microsoft Exchange and O365 messaging environments

 * Manage mail flow, connectivity, security, and high availability for mission-critical systems
 * Perform upgrades, patching, backup, and recovery of Exchange infrastructure
 * Implement and monitor security, compliance, and retention policies
 * Troubleshoot complex messaging issues and provide Tier III support
 * Automate routine administration with Power
 * Shell and related tools
 * Collaborate with cybersecurity, network, and systems teams on integrated solutions
 * Document architecture, standards, and procedures and mentor junior staff