Messaging Engineer

CORNERSTONE GLOBAL PARTNERS PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Cornerstone Global Partners is seeking a Messaging Engineer to administer and support enterprise messaging services, focusing on Exchange 2016+ and Exchange Online in hybrid environments. You will manage mailboxes, mail flow, and security controls, while implementing automation via PowerShell and collaborating with networking and security teams.

The role requires deep knowledge of SPF/DKIM/DMARC, DNS, and email routing, plus strong troubleshooting and stakeholder communication skills in a global

Qualifications

• 5+ years of experience in Messaging Engineering, Microsoft Exchange, Microsoft 365, or Email Security.
• Hands-on Exchange 2016+ and Exchange Online with hybrid environments.
• Experience with Cisco IronPort and Defender for Office 365 is preferred.

Responsibilities

• Provide L2/L3 administration and escalation support for enterprise messaging services.
• Manage Exchange Online mailboxes, configurations, quotas, and PowerShell administration.
• Troubleshoot mail flow, routing, connectors, and security controls.
• Develop PowerShell scripts for automation and operational improvements.
• Support incidents, changes, and releases for messaging services.
• Work with networking and security teams on DNS, firewalls, and load balancers.
• Create technical documentation and contribute to knowledge bases.

Skills

Exchange 2016+

Exchange Online

Hybrid environments

Email security

PowerShell scripting

DNS

Firewalls

Load balancers

Troubleshooting

Stakeholder management

Communication

ITIL knowledge

Tools

Cisco IronPort

Secure Email

Defender for Office 365

Job description

Messaging Engineer

Job Responsibilities

• Provide L2/L3 administration and escalation support for enterprise messaging services, focusing on Cisco IronPort, Microsoft EOP/ATP, Exchange, and Microsoft 365/O365.
• Administer and troubleshoot Microsoft Exchange 2016+, including hybrid environments and complex mail flow issues.
• Manage Exchange Online mailboxes, configurations, quotas, inbox rules, permissions, and PowerShell administration.
• Troubleshoot and manage email routing, connectors, transport rules, and inbound/outbound mail flow.
• Maintain and support email security controls including anti-spam, anti-malware, anti-phishing, impersonation protection, and quarantine policies.
• Investigate email security threats and implement appropriate mitigation measures.
• Provide strong expertise in SPF, DKIM, DMARC, ARC, SMTP, DNS, and email routing.
• Develop and execute PowerShell scripts for administration, automation, and operational improvements.
• Support incidents, problems, changes, upgrades, patches, and release management for messaging services.
• Participate in messaging projects as a Subject Matter Expert, supporting implementation, migration, integration, and deployment activities.
• Develop and maintain business continuity, disaster recovery, and production support procedures.
• Work with network and security teams on issues involving DNS, firewalls, and load balancers.
• Create technical documentation and knowledge base articles to reduce recurring service desk incidents.
• Proactively identify potential service issues and recommend improvements to ensure operational stability.

Requirements

• 5+ years of experience in Messaging Engineering, Microsoft Exchange, Microsoft 365, or Email Security.
• Strong hands‑on experience with Exchange 2016+, Exchange Online, and hybrid environments.
• Experience with Cisco IronPort / Secure Email and Microsoft EOP/Defender for Office 365.
• Strong knowledge of email security, mail flow, routing, SPF, DKIM, DMARC, ARC, and SMTP.
• Proficient in PowerShell scripting.
• Good understanding of DNS, network firewalls, and load balancers.
• Strong troubleshooting, analytical, and problem‑solving skills.
• Good communication and stakeholder management skills.
• Able to work independently and effectively in a global enterprise environment.
• Microsoft 365 / Messaging certifications and ITIL knowledge will be advantageous.

https://www.cgpgroup.com/privacy-policy

Cornerstone Global Partners (EA LicenseNumber: 19C9859) is an affirmative equal‑opportunity employer and recruitmentfirm. We evaluate qualified applicants without regard to race, colour,religion, creed,gender, sexual orientation, gender identity, maritalstatus, national origin, age, veteran status, disability, or any otherprotected class.

Eugene Then
[e-mail]

EA Registration Number: R22104742.

Cornerstone Global Partners Pte Ltd (EA License:19C9859)