Microsoft 365 E-mail Specialist | The Hague / Hybride

Are you an email specialist who truly understands mail flow and enjoys diving deep into the technical side of things? Do you get energized by solving complex email issues in a large enterprise environment? Then we’re looking for you.

As a Microsoft 365 Email Specialist, you are the technical expert responsible for our email infrastructure within the Microsoft 365 environment. You will work in an informal, diverse Scrum team that manages the full M365 suite. Your focus is on Exchange Online and everything related to email: from delivery troubleshooting to Defender policies, and from PowerShell automation to advising other departments.

You won’t be working alone — you will strengthen our current email specialist, and together you will form the organization’s email expertise team. You will operate at 3rd-line support level, meaning complex email-related incidents are escalated to you. You work autonomously, while maintaining close collaboration with colleagues and stakeholders across the organization.

Your responsibilities

• Manage and configure Exchange Online in a large enterprise environment.
• Diagnose and resolve complex delivery and mail flow issues.
• Configure and maintain mailboxes, distribution groups, and Exchange policies.
• Implement and manage email security using Microsoft Defender for Office 365 (anti-spam, anti-phishing, malware protection).
• Develop PowerShell scripts to automate daily administrative tasks and optimizations.
• Provide 3rd-line support for escalations from the service desk (via Freshworks).
• Collaborate with other departments on email-related needs and solutions.
• Contribute to knowledge sharing and documentation within the team.

What makes our team great?

• A large, complex environment that offers real technical challenges.
• A diverse, informal team with an entrepreneurial mindset.
• Autonomy and plenty of room for your own input and ideas.
• A dynamic environment with many opportunities.
• A strong focus on learning and growth — experience matters, but curiosity and the ability to learn are just as valuable.

You have hands-on experience managing Exchange Online and the technical depth to go beyond standard configurations. You understand how email delivery works — from message tracing to Defender layers — and can independently diagnose and resolve mail flow and delivery issues.

Must-haves

• Mid-level experience with Exchange Online management and configuration.
• In-depth knowledge of email delivery troubleshooting and mail flow (message trace, NDRs, connectors, transport rules, etc.).
• Experience with Microsoft Defender for Office 365 (anti-spam policies, anti-phishing, threat protection).
• Knowledge of email security fundamentals: SPF, DKIM, DMARC, and how they function.
• PowerShell scripting experience — you have written scripts and are eager to further develop your skills.
• Affinity with 3rd-line support and complex troubleshooting.
• Strong communication skills in Dutch and English — able to clearly explain technical matters to non-technical stakeholders.

Nice-to-haves

• Experience working in Agile/Scrum teams.
• Knowledge of Compliance & eDiscovery within M365.
• Experience with hybrid Exchange environments (on-premises/cloud).
• Relevant Microsoft certifications.
• Experience with Azure DevOps.
• Experience with Freshworks.

Challenging and varied work with a real impact. And plenty of opportunities as, at TNO, you are in charge of shaping your career. We offer a gross monthly salary between € 4.000,- and € 5.200,- (based on your knowledge and experience), 8% holiday pay, a 13th month bonus of 8.33% and a flex budget (5.58% + € 180). This means your monthly salary will therefore be between €4,600 and €6,000 in total. In addition, you will be given every opportunity to develop yourself.

TNO offers optional employee benefits, enabling you to tailor your benefits package to match your personal situation. You may also expect:

• An extremely professional, innovative working environment where colleagues are leading experts in their field.
• The opportunity to attend courses, workshops and conferences, and to receive training and coaching based on your needs.
• 34 days annual leave on a full-time basis.
• An employer that values and encourages diverse talent, with initiatives like the Female Leadership Program, our Rainbow Community and round tables on inclusion topics.
• We offer a comprehensive and flexible mobility plan that also includes full compensation for public transportation for commuting and business travel[OPTIONAL] or a leased car.
• Great social events with your team and other TNO colleagues. That’s how you will get to know a lot of people really quickly.
• Flexible working hours, the possibility to work parttime (32 of 36 hours) and the possibility of working from home.
• A good pension scheme.

Read more about tailoring your benefits package.

At TNO, we innovate for a healthier, safer and more sustainable life. And for a strong economy. Since 1932, we have been making knowledge and technology available for the common good. We find each other in wonder and ingenuity. We are driven to push boundaries. There is all the space and support for your talent and ambition. You work with people who will challenge you: who inspire you and want to learn from you. Our state-of-the-art facilities are there to realize your vision. What you do at TNO matters: impact makes the difference. Because with every innovation you contribute to tomorrow’s world. Read more about TNO as an employer.

At TNO we encourage an inclusive work environment, where you can be yourself. Whatever your story and whatever unique qualities you bring to the table. It is by combining our unique strengths and perspectives that we are able to develop innovations that make a real difference in society. Want to know more? Read what steps we are taking in the area of diversity, equity and inclusion.

Please apply before the 12th of April, 2026. The selection process comprises two interview rounds. In a final meeting we will discuss the terms of employment and your tailored benefits package. We aim to finalize the entire process within four weeks.

The selection process may include an online assessment and a reference check.

A certificate of Conduct (VOG) is required before starting a new job at TNO.

As you will be working for clients in the domain of defence and security, a Certificate of No Objection issued by AIVD (the Dutch General Intelligence and Security Service) is mandatory. This means you will have to undergo a security screening. Read more about security screening.