Senior Messaging Lead

Overview

In this role you lead and advance KBR’s enterprise messaging environment, driving secure mail flow, hybrid Exchange services, and messaging security. You will act as the senior technical escalation point for complex mailbox and Outlook issues while line-managing a messaging administrator. The role collaborates with Cybersecurity, Legal, Privacy and Compliance, and other teams to maintain reliable, compliant messaging services. You’ll shape incident response, automation, and operational documentation, delivering secure, scalable messaging operations.

Responsibilities

• Provide senior technical leadership for Exchange Online, Exchange hybrid services and mail security platforms
• Line manage and develop one messaging administrator, overseeing performance and objectives
• Administer mail flow components (connectors, domains, transport rules, SMTP relays, shared/mail-enabled/storage)
• Maintain Exchange hybrid services including routing, certificates, and Autodiscover
• Monitor Microsoft 365 service health and notifications
• Administer Defender for Office 365 controls and security tooling
• Integrate Abnormal Security and KnowBe4 Phish Alert Button
• Investigate and remediate email-borne threats with Cybersecurity and SOC
• Serve as escalation point for Outlook/messaging issues
• Support Entra ID dependencies, app registrations, OAuth and Graph integrations
• Ensure least-privilege application permissions and compliance with approvals
• Support messaging retention, eDiscovery, and compliance with Legal/Privacy teams
• Lead or support major messaging incidents and RCA activities
• Develop PowerShell and Graph automation for messaging administration and reporting
• Maintain documentation and service records
• Manage relationships and escalations with Microsoft, Abnormal Security, KnowBe4 and suppliers

Key requirements

• Deep hands-on experience administering Exchange Online and hybrid environments
• Advanced experience with Defender for Office 365 and email security operations
• Strong knowledge of enterprise mail flow, connectors, transport rules, SMTP relay, authentication and Autodiscover
• Strong Outlook and mailbox troubleshooting capability
• Experience with Entra ID dependencies, app registrations, service principals, OAuth and API permissions
• Strong Exchange Online PowerShell and Microsoft Graph skills
• Experience leading major incidents and problem management
• Experience mentoring or line managing messaging staff
• Strong written and verbal communication skills for technical and non-technical stakeholders
• Desirable: experience with Abnormal Security, KnowBe4, Microsoft Purview, global 365 environments or regulated organisations
• Desirable: relevant Microsoft and ITIL qualifications

• leadership and coaching
• clear written and verbal communication
• stakeholder management
• Exchange Online administration
• Exchange Server hybrid
• Microsoft Defender for Office 365

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