> Markdown version of [/jobs/ext/4699823-m365-messaging-collaboration-sme](https://www.wearedevelopers.com/jobs/ext/4699823-m365-messaging-collaboration-sme). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # M365 Messaging & Collaboration SME - **Company:** Proactive.IT Appointments Ltd. - **Location:** Epsom, United Kingdom - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Cyber Security, Data Security, Domainkeys Identified Mail, Domain-Based Message Authentication Reporting and Conformance (DMARC), Email Filtering, Microsoft Office, Windows PowerShell, Anti-Phishing, Sender Policy Framework (SPF), 3-tier Architectures - **Published:** November 13, 2026 - **Apply:** https://www.apply4u.co.uk/jobs/m365-messaging-collaboration-sme/55867546 ## About the Role Essential Skills & Experience Minimum 5 years' experience engineering and supporting Microsoft 365 environments. Strong hands-on experience with Exchange Online administration and troubleshooting. Extensive Microsoft Teams configuration and support experience. Practical experience with Microsoft Purview, including DLP and compliance policies. Experience with Microsoft Defender for Office 365 and Exchange Online Protection. Knowledge of enterprise email security platforms, ideally Proofpoint. Experience supporting Exchange Hybrid environments and migrations. ## Description We are working with a leading organisation to recruit an experienced Microsoft 365 Messaging & Collaboration SME to join its Digital Engineering team. This is an excellent opportunity for a hands-on Microsoft 365 specialist with strong experience across Exchange Online, Microsoft Teams, Microsoft Purview and enterprise email security solutions. You will be responsible for engineering, maintaining and improving business-critical messaging and collaboration services, providing advanced technical support and delivering platform enhancements across a complex enterprise environment. We are looking for someone who enjoys working hands-on with technology, resolving complex issues and acting as a technical subject matter expert. Key Responsibilities Microsoft 365 Engineering Engineer, configure and maintain Microsoft 365 messaging and collaboration services. Administer and support Exchange Online, including mail flow, transport rules, shared mailboxes and permissions. Configure, maintain and troubleshoot Microsoft Teams. Support Exchange Hybrid environments, migrations and tenant optimisation. Implement platform improvements and new Microsoft 365 capabilities. Security & Compliance Manage Microsoft Defender for Office 365, Exchange Online Protection and Proofpoint. Configure email security, anti-spam, anti-phishing and threat protection policies. Support Microsoft Purview, including DLP, Information Protection, Retention and eDiscovery. Maintain email authentication standards, including SPF, DKIM and DMARC. Work with Cyber Security teams to improve Microsoft 365 security and compliance. Technical Support & Operations Provide Tier 3 technical support and act as an escalation point for complex issues. Troubleshoot Exchange Online, Teams, mail flow and email security incidents. Perform root cause analysis and implement permanent solutions. Monitor service performance, availability and platform health. Support incident, problem and change management. Maintain technical documentation and operational procedures. Automation & Improvement Develop PowerShell scripts to automate Microsoft 365 administration. Use Microsoft Graph and administration tools to improve operational efficiency. Identify opportunities for automation and service improvement.