Office Administrator - Messaging/O365 & Cisco Email Security

About the Role

This position involves managing Microsoft 365 Messaging environments alongside Cisco Email Security systems, in a full-time onsite role located in Chennai. Candidates will be involved in administering, migrating, securing, and supporting email infrastructures within a global enterprise environment.

Key Responsibilities

• Administer Microsoft 365 Messaging services including Exchange Online, Exchange Hybrid, and Exchange Server 2019 environments.
• Manage mailbox lifecycle, mail flow, transport rules, SMTP relays, and conduct message tracing.
• Operate and maintain Cisco Email Security Appliance (ESA) and Cisco Cloud Email Security (CES) technologies.
• Lead Cisco ESA to CES migration projects encompassing planning, assessment, policy transfer, mail flow redesign, implementation, testing, and post-migration support.
• Maintain comprehensive knowledge of email security protocols and infrastructure elements such as SMTP, DNS, SPF, DKIM, DMARC, TLS, MX Records, and Autodiscover.
• Oversee Microsoft Entra ID (Azure AD), Azure AD Connect, ADFS, SSO, MFA, Conditional Access, and overall identity management solutions.
• Administer collaborative tools including Microsoft Teams, OneDrive for Business, SharePoint Online.
• Manage Microsoft Defender for Office 365 and other email threat protection platforms.
• Utilize Microsoft Purview Compliance Portal services including Data Loss Prevention (DLP), eDiscovery, Retention Policies, Content Search, and compliance management.
• Handle incident, problem, and change management activities, including root cause analysis, specifically for critical priority incidents in a global enterprise setting.
• Develop and use PowerShell scripts and Exchange Online PowerShell to automate administrative processes.
• Employ Microsoft Graph API for automation and administrative purposes.
• Diagnose and troubleshoot mail routing, delivery challenges, phishing, spoofing, and other mail security incidents.

Additional Information

A walk-in recruitment drive is scheduled for August 8, 2026, at Tata Consultancy Services located in SIPCOT Information Technology Park, Navalur Post, Siruseri, Chennai, Tamil Nadu, 603103.