Email Services Systems Administrator – TS/SCI with Polygraph

General Dynamics Information Technology

Email Services Systems Administrator supporting national defense, operating enterprise email and messaging services. Ensuring high availability and secure operations across multinetwork environments with seamless integration.

Posted 6/16/2026full-timeAnnapolis Junction • Colorado, District of Columbia, Florida, Maryland, Virginia • 🇺🇸 United StatesMid-LevelSenior💰 $96,569 - $130,651 per yearWebsite

Tech Stack

Tools & technologies

CloudDNSSMTP

About the role

Key responsibilities & impact

Own your opportunity to support national defense.
Support national defense by maintaining high availability email platforms
Ensure reliable communication services and sustain cloud-enabled collaboration capabilities
Administer, maintain, and troubleshoot enterprise Exchange and M365 email systems
Support email architecture components including mailbox databases, transport services, journaling, archival/retention systems, SMTP relays, and message hygiene tools
Manage identity and access for messaging services
Monitor system health, capacity, and performance; perform diagnostics; and implement corrective actions for service disruptions
Support migrations, upgrades, and sustainment of both on-premise and cloud-based messaging platforms
Execute backup, recovery, and failover operations for Exchange systems

Requirements

What you’ll need

6+ years of related experience
Email Management
Email Services
Exchange
U.S. Citizenship Required
Hands-on experience administering Exchange (on-premises) and M365 messaging services in enterprise or multi-network environments
Strong proficiency with email routing, SMTP, DNS, authentication, certificates, and mobile/remote email access
Experience with secure configuration, retention/archival policies, and compliance requirements for enterprise messaging
Familiarity with patching, vulnerability remediation, and configuration compliance for messaging platforms
Strong documentation, communication, and cross team collaboration skills

Benefits

Comp & perks

Comprehensive benefits and wellness packages
401K with company match
Paid time off
Flexible work weeks where possible
Vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave
Short and long-term disability benefits
Life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

ExchangeM365email managementemail servicesSMTPDNSbackup and recoveryfailover operationscloud-based messagingon-premise messaging

Soft Skills

documentationcommunicationcross team collaboration