O365 Engineer (Senior)

Key Responsibilities:

• Plan and execute mailbox and distribution list (DL) migrations from Exchange On-Premises to Exchange Online.

• Perform pre-migration assessments, readiness checks, and post-migration validation.

• Design and implement secure and scalable SMTP relay solutions in Exchange Online.

• Transition mail routing from on-premises to cloud-based infrastructure with minimal disruption.

• Configure and manage connectors, transport rules, accepted domains, and hybrid mailflow settings.

• Troubleshoot mail delivery issues across hybrid environments and ensure message traceability.

• Integrate Mimecast with Exchange Online for continuity, archiving, and security.

• Migrate journaling, retention, and compliance policies from on-premises to Mimecast and Microsoft 365.

• Administer Exchange Online, including mailbox provisioning, shared mailboxes, and group management.

• Monitor mailflow, service health, and performance using Microsoft 365 admin center and message trace tools.

• Implement SPF, DKIM, and DMARC to enhance email security and prevent spoofing.

• Collaborate with security teams to align mailflow configurations with organizational policies.

• Automate routine tasks and reporting using PowerShell and Microsoft Graph.

• Maintain detailed documentation including migration plans, configurations, and troubleshooting guides.

• Provide Tier 2/3 support for messaging-related incidents and service requests.

• Conduct knowledge transfer sessions and training for IT support and end-users.

• Coordinate with vendors and Microsoft support for escalations and advanced troubleshooting.

• Participate in change management and risk assessments for messaging infrastructure changes.

• Ensure compliance with data protection regulations and internal governance policies.

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  Required Skills:

• 5+ years of experience with Microsoft Exchange (On-Prem & Online).

• Hands-on experience with mailbox and DL migrations.

• Strong understanding of SMTP, DNS, SPF, DKIM, and DMARC.

• Experience with Mimecast administration and integration.

• Proficiency in PowerShell scripting.

• Familiarity with hybrid Exchange environments.

• Excellent troubleshooting and communication skills.

Preferred Qualifications:

• Microsoft certifications (e.g., MS-203, MS-102).

• Experience with migration tools (e.g., Quest, BitTitan).

• Knowledge of Microsoft Defender for Office 365.

• Experience in regulated industries (e.g., finance, healthcare).