Email Security Engineer - Proofpoint Specialist

Grant Thornton Ireland is looking for an experienced Email Security Engineer with deep expertise in Proofpoint Email Security Gateway to strengthen our global cyber defence program. The role will focus on designing, managing, and optimising secure email infrastructure to protect against phishing, malware, and advanced threats while balancing user experience, operational efficiency and regulatory compliance.

This role will be a key contributor to the company’s cybersecurity strategy, working closely with SOC, incident response and threat‑intelligence teams and supporting global operations through an on‑call rotation.

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• Administer, configure and maintain the Proofpoint Email Security Gateway and related modules (TAP, TRAP, DLP, encryption, impersonation protection, etc.)
  
• Develop and manage email security policies for threat prevention, data protection and regulatory compliance
  
• Monitor and analyse email traffic, quarantines, logs and alerts to identify, investigate and remediate threats
  
• Conduct rule‑set tuning, phishing banner adjustments and reporting for continuous optimisation
  
• Collaborate with SOC, incident response and threat‑intelligence teams to respond to phishing campaigns and advanced email‑based threats
  
• Provide expertise in user awareness campaigns by correlating security telemetry with phishing simulation results
  
• Document configurations, standard operating procedures and technical controls for global deployment
  
• Partner with Microsoft 365 security teams to ensure consistent enforcement of tiered email security controls across platforms
  
• Support M&A integrations by onboarding new domains and aligning email security posture with global standards
  
• Ensure compliance with internal security requirements and external regulations (GDPR, DORA, ISO, etc.)
  
• Participate in an on‑call rotation to support global operations
  

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• Bachelor’s degree in information security, Computer Science or related field (or equivalent experience)
  
• 5+ years of hands‑on experience in email security with strong expertise in Proofpoint administration
  
• Proficiency in SMTP, DNS (SPF, DKIM, DMARC), TLS and email routing
  
• Solid understanding of phishing tactics, social engineering threats and business email compromise (BEC)
  
• Experience with incident response, log analysis and security reporting
  
• Strong troubleshooting and problem‑solving skills in enterprise environments
  
• Excellent communication skills to engage with both technical teams and business stakeholders
  

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• Proofpoint Certified Administrator (or equivalent certification)
  
• Experience integrating Proofpoint with Microsoft 365 or Google Workspace security ecosystems
  
• Familiarity with SIEM tools, SOAR automation and phishing simulation platforms
  
• Knowledge of global regulatory and compliance requirements related to email security and data protection
  

Our reward and benefits package is designed to create an environment where our people can flourish, supporting a healthy lifestyle and professional growth. Full details are provided to selected candidates during the interview process.

Grant Thornton is an equal‑opportunity employer. xcfaprz We celebrate diversity and inclusion and welcome applicants from all backgrounds, identities, cultures, and experiences.