Routing L3 Support Engineer - Linux

We are hiring a Level 3 Email Routing Support Engineer to join our core Linux-based email infrastructure team. As senior members of our established team prepare for retirement, we are seeking a strong technical lead who can maintain operational continuity (BAU) for our legacy environment while helping drive modernizations for our messaging architecture.

This position is structured with a direct path toward FTE conversion, making it ideal for an experienced engineer seeking a long-term home.

PRIMARY RESPONSIBILITIES

L3 Incident Resolution & Support (BAU): Serve as the final escalation point for complex email delivery failures, mail flow deferrals, and routing misconfigurations.

MTA & Gateway Administration: Maintain and tune Proofpoint secure email gateways, alongside Sendmail and Postfix mail transfer agents running on Linux.

Legacy Application Support: Troubleshoot legacy Windows Server email routing configurations and application-generated mail flow to ensure seamless relaying to our Linux core.

Modernization & Automation: Identify opportunities to upgrade legacy Sendmail/Postfix rules, implement modern authentication standards (SPF, DKIM, DMARC), and automate queue monitoring via Bash, Python, or PowerShell.

Knowledge Transfer & Succession: Work closely with retiring senior engineers to document legacy system architectures, custom routing maps, and standard operating procedures., Messaging Infrastructure Support

? Provide day-to-day operational support for enterprise email and collaboration infrastructure.

? Install, configure, maintain, and troubleshoot messaging applications and supporting

technologies.

? Ensure availability, reliability, and performance of messaging systems in accordance with

established SLAs.

? Support SMTP email processing, mail routing, delivery, and message hygiene services.

• Experience level: Experienced
• Minimum 5 years of experience
• Education: Bachelors (required)

skills:

Antivirus,Bash,configuration management,Anti-Spam,messaging technologies,messaging systems,Data Loss Prevention,Korn Shell,Linux/UNIX,Linux,log analysis,Malware,Windows,service monitoring,monitoring tools,monitoring and observability tools,Nagios,Operations System,Perl,Python,enterprise Linux,scripting,Shell scripting,SMTP,Splunk,system availability,UNIX,Windows Server,analytical,Excellent written and verbal communication,communicate effectively,organizational skills,committed,problem resolution,troubleshoot,Troubleshooting,problem-solving capabilities,reliability,proactively,Ability to work independently,proactive approach,Collaboration,24x7,System Administration,administration,Architecture,Install,automation,continuous improvement,business needs,Change Management,construction,corrective and preventive actions,Diagnose,email processing,email security,Engineering Support,incident management,Problem Management,incident response,ITIL processes,infrastructure,Infrastructure Support,infrastructure knowledge,hygiene,maintenance,system maintenance,optimization recommendations,operating systems,operational support,production support,root cause investigations,security,service improvement,enterprise collaboration,system design,resolve technical issues,testing,user requirements,Windows-based systems,Windows environments