Job Description

Senior M365 Messaging & Security Engineer

We are looking for a Senior IT System Engineer with extensive experience in Microsoft messaging environments, secure integrations, and M365 security architectures within complex multi-forest and multi-tenant environments.

Key Responsibilities

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  Design, implement, and support secure M365 and messaging infrastructures
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  Manage and secure SMTP flows through Exchange Online and Fortimail
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  Configure and maintain anti-spam, quarantine, blacklisting, and mail protection mechanisms
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  Implement secure integrations between M365 and third-party systems
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  Manage identity protection and synchronization across multi-forest environments
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  Develop and automate processes using PowerShell, Microsoft Graph, and scripting tools
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  Support advanced Microsoft Purview features including:
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    Data Lifecycle Management
  • 
    Auditing
  • 
    eDiscovery
  • 
    Information Barriers
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  Troubleshoot complex Outlook, Exchange Online, and hybrid cloud/on-premise environments
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  Monitor security alerts and support investigations with security teams
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  Create technical documentation, standards, procedures, and architecture designs
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  Contribute to roadmap planning, technology watch, and infrastructure improvements

Required Skills & Experience

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  15+ years of experience in messaging and collaboration technologies
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  Strong expertise in:
  • 
    Exchange Online
  • 
    Microsoft 365 & Outlook
  • 
    Entra ID / Entra Connect
  • 
    Fortimail
  • 
    SMTP and mTLS
  • 
    Microsoft Graph
  • 
    PowerShell scripting and automation
  • 
    Microsoft Defender for Cloud
  • 
    Microsoft Purview
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  Deep understanding of hybrid cloud/on-premise integrations and certificate management
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  Experience in complex multi-tenant, multi-domain, and multi-forest environments
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  Strong knowledge of GDPR and security best practices

Certifications (Preferred)

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  MS-203: Microsoft 365 Messaging
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  AZ-900: Azure Fundamentals
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  ITIL Foundation

Profile

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  Strong analytical and troubleshooting skills
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  Able to work autonomously and within multidisciplinary teams
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  Experience managing complex technical requests and infrastructure projects
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  Excellent documentation and communication skills

Languages

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  French and Dutch: professional proficiency
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  English: full professional proficiency

Work Setup

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  Hybrid working model with minimum 2 days onsite per week
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  Location: Brussels