Senior Microsoft 365 Exchange Hybrid Messaging Engineer

Dineshwaran Ganesan

Senior Messaging & Cloud Engineer Microsoft 365 & Exchange Hybrid Specialist

PROFESSIONAL SUMMARY

***********.*********@*****.*** linkedin.com/in/dineshwaran-ganesan/ +91-701******* Chennai, India TECHNICAL SKILLS

PROFESSIONAL EXPERIENCE

Tata Consultancy Services

Messaging & Cloud Collaboration: Microsoft Exchange Online, Exchange Server (2016/2019), Exchange Hybrid Configuration, Mailbox Migrations (Cutover, Staged, Hybrid), Mail Flow Architecture, Transport Rules, Inbound/Outbound Connectors, Accepted Domains, Microsoft 365 Groups, Teams & OneDrive for Business. Identity & Access Management: Microsoft Entra ID (Azure AD), Active Directory Domain Services (AD DS), Microsoft Identity Manager (MIM), Conditional Access, MFA, User Lifecycle Management (JML), RBAC, License Administration.

Results-driven Senior Messaging & Cloud Engineer with 5+ years of experience managing and optimizing enterprise Microsoft 365, Exchange Online, and Exchange Hybrid environments. Proven expertise in mail flow architecture, cross-platform migrations, and email security administration across Banking and Manufacturing domains. Skilled in identity lifecycle management using Microsoft Entra ID, MIM, and Active Directory, with strong capabilities in automating tenant operations using PowerShell. Track record of maintaining 99.9% mail flow uptime and defending enterprise messaging perimeter using EOP, Cloudflare, and Symantec. Email Security & Hygiene: Exchange Online Protection (EOP), Cloudflare Email Security, Symantec Email Security, SPF, DKIM, DMARC, Anti-Spam & Anti-Phishing Policies, Quarantine Investigation, Threat Remediation. Automation & Scripting: PowerShell, Exchange Online PowerShell, Scripting for Bulk Provisioning & Reporting. ITSM & Compliance: ServiceNow, Ivanti, Incident & Major Incident Management, Change Advisory Board (CAB), SLA Governance, Litigation Hold, Retention Policies, eDiscovery. Senior Messaging Engineer (Cloud Analyst) Jan 2025 - Present Managed dual enterprise environments (Exchange Online & Exchange On-Premises), ensuring uninterrupted hybrid mail delivery, high availability, and 99.9% service uptime for global users. Resolved complex end-to-end mail flow and delivery failures, diagnosing issues across Transport Rules, Inbound/Outbound Connectors, TLS handshake/encryption, and accepted domains. Governed messaging security perimeter via Symantec Email Security, handling spam/phishing mitigation, message tracking, and quarantine remediation while maintaining mail hygiene. Handled escalated messaging support for Microsoft 365, resolving critical Shared Mailbox issues, delegation conflicts, calendar synchronization/free-busy errors, and advanced Outlook desktop/web client issues. Engineered an automated compliance reporting pipeline using PowerShell and Power Automate to execute monthly message traces and automatically archive reports to users OneDrive repositories. Executed hybrid mailbox migration batches from on-premises to Exchange Online, troubleshooting sync failures, MRS proxy errors, and target provisioning conflicts with zero data loss. Managed SSL/TLS certificate renewals and bindings across Exchange servers, preventing service outages, and configured automated scheduled monitoring tasks to ensure high availability of critical messaging services. Managed P1/Major incidents and standard changes (CRs) end-to-end via ServiceNow, coordinating with network and security teams to ensure 100% SLA compliance.

Infosys Limited

Senior System Engineer (Messaging Engineer) June 2021 - October 2024 Delivered end-to-end messaging operations and user support for enterprise clients across Healthcare and Retail domains, ensuring high service availability and strict compliance with domain regulations. Engineered custom Mail Flow rules (Transport Rules), MailTips, and automated organizational disclaimers/auto- replies aligned with evolving business and regional communication policies. Provided high-touch L2 technical support, conducting direct 1-on-1 user troubleshooting sessions to resolve complex Outlook profile corruptions, autodiscover errors, and mailbox delegation conflicts. Governed email authentication and domain security, actively configuring and validating SPF, DKIM, and DMARC records to prevent domain spoofing and resolve message delivery rejections. Provisioned and maintained Exchange resources, including room/equipment mailboxes, shared mailboxes, and distribution lists based on departmental and user operational needs. Authored technical Knowledge Base (KB) articles and standard operating procedures (SOPs) for common messaging issues, and contributed to configuring self-service support chatbots to deflect routine user tickets. Executed security and compliance investigations, running Exchange audit logs, compliance searches, and eDiscovery export requests for legal hold and data governance requirements. EDUCATION

Bachelor of Engineering (B.E.) in Mechanical Engineering 2016 – 2020 TJS Engineering College, Anna University, Chennai CGPA : 7.1 LANGUAGES

English (Professional)

Tamil (Native)

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