Security Engineer - Email Security
Zelis
United States, Florida, USA, New Jersey, USA, St Petersburg, Russia, Creve Coeur, MO, USA, Boston, MA, USA, Atlanta, GA, USA, Morristown, TN, USA, America, AL, USA · $135k–$186k a year · Posted September 30, 2026
More in Florida job market · Healthcare & Hospital Systems · Security jobs
Pay compared with the market
This listing pays about $160,550 a year. Across 90 open security engineer listings that state pay, the middle half runs $155,500 to $264,000 and the median is $200,500. That is inside the middle half of those listings, 20% below the median.
Listed pay is what employers advertise, not what people are paid.
About the job
At Zelis, we Get Stuff Done. So, let’s get to it!
A Little About Us
Zelis is modernizing the healthcare financial experience across payers, providers, and healthcare consumers. We serve more than 750 payers, including the top five national health plans, regional health plans, TPAs and millions of healthcare providers and consumers across our platform of solutions. Zelis sees across the system to identify, optimize, and solve problems holistically with technology built by healthcare experts – driving real, measurable results for clients.
At Zelis, AI is woven into the fabric of how we work. Every associate is expected - and empowered - to partner with AI to challenge the status quo, accelerate innovation, and amplify their impact. This is a place for builders with a growth mindset who act with agility, embrace change, and use modern technology to shape smarter solutions, exceptional experiences, and the future of our industry for our clients, customers, and our culture.
A Little About You
You bring a unique blend of personality and professional expertise to your work, inspiring others with your passion and dedication. Your career is a testament to your diverse experiences, community involvement, and the valuable lessons you've learned along the way. You are more than just your resume; you are a reflection of your achievements, the knowledge you've gained, and the personal interests that shape who you are.
Position Overview Zelis is seeking a Security Engineer - Email Security to support and enhance the security, reliability, and protection of our enterprise email environment. This role will focus on identifying and preventing email-based threats, administering email security controls, troubleshooting mail-flow and security issues, and supporting Microsoft 365/Exchange Online environments. The ideal candidate has hands-on experience with Microsoft Exchange, email security technologies, phishing investigations, mail-flow analysis, and security incident response. This individual will work closely with Security Operations, Messaging/Infrastructure, Identity, and other technology teams to protect the organization from phishing, business email compromise (BEC), malware, spoofing, and other email-based threats.
Key Responsibilities
Perform detailed analysis of suspicious messages, including email headers, message routing, URLs, attachments, sender reputation, authentication results, and other indicators of compromise.
Administer and support email security controls within Exchange Online, Defender for O365, EasyDMARC, and Abnormal Security environments.
Troubleshoot email delivery, mail-flow, quarantine, filtering, and security-policy issues.
Review and analyze Exchange message traces and mail-flow logs to determine message disposition and identify security or delivery issues.
Configure and maintain mail-flow rules, anti-spam policies, anti-phishing protections, allow/block lists, quarantine policies, and related email security controls.
Support incident containment and remediation activities, including message removal, sender/domain blocking, URL blocking, mailbox remediation, and escalation of compromised accounts.
Assist with administration and tuning of Microsoft Defender for Office 365 or comparable secure email gateway/email security technologies.
Analyze and troubleshoot email authentication technologies including SPF, DKIM, and DMARC .
Identify false positives and false negatives and recommend improvements to email security policies and detection rules.
Document investigations, findings, remediation actions, and recurring email security issues.
Create and maintain operational procedures, troubleshooting guides, and knowledge-base documentation.
Collaborate with SOC, Incident Response, Identity and Access Management, Infrastructure, and Messaging teams during security investigations.
Assist with email security metrics, reporting, trend analysis, and continuous improvement initiatives.
Stay current on emerging phishing techniques, business email compromise tactics, attacker infrastructure, and email security best practices.
Required Qualifications
5+ years of proven experience designing and implementing enterprise-grade email security guardrails in regulated fintech or healthcare environments with a strong security-first mindset and expertise in phishing and BEC prevention, email authentication, data loss prevention, policy enforcement, monitoring, and incident response.
3+ years of hands-on experience with Microsoft Exchange , Exchange Online, or Microsoft 365 messaging environments.
Working knowledge of Microsoft Exchange mail flow, connectors, transport/mail-flow rules, message tracking, and message tracing.
Experience investigating phishing, spam, malware, spoofing, and business email compromise incidents.
Strong understanding of email protocols and technologies, including SMTP, DNS, SPF, DKIM, and DMARC .
Experience analyzing email headers and determining message origin, routing, authentication results, and potential indicators of malicious activity.
Familiarity with Microsoft Defender for Office 365 , Exchange Online Protection (EOP), or similar enterprise email security platforms.
Understanding common attacker techniques involving credential phishing, malicious attachments, malicious URLs, impersonation, and account compromise.
Strong analytical, troubleshooting, documentation, and communication skills.
Ability to independently investigate moderately complex incidents and appropriately escalate high-risk or advanced threats.
Preferred Qualifications
Experience with Microsoft Defender for Office 365 , including Safe Links, Safe Attachments, Threat Explorer, automated investigation and response, and related capabilities.
Experience using Microsoft Purview , Microsoft Sentinel, or the Microsoft Defender security ecosystem.
Experience with PowerShell for Exchange Online administration, investigation, or automation.
Familiarity with other Microsoft tools; Defender for Endpoint, Purview, etc. Support administration, monitoring, and policy tuning of EDR/XDR platforms.
Experience investigating compromised Microsoft 365 accounts and malicious inbox or forwarding rules.
Knowledge of email security gateways or platforms such as Proofpoint, Mimecast, Cisco Secure Email, Abnormal Security, or similar technologies.
Familiarity with threat intelligence concepts, indicators of compromise (IOCs), and attacker tactics, techniques, and procedures (TTPs).
Knowledge of AI/ML security concepts and emerging threats, data leakage, model abuse, identity and access controls, secure integrations, and protection of sensitive data within AI-enabled systems.
Core Competencies
Email Security & Threat Analysis
Microsoft Exchange / Exchange Online
Microsoft 365 Security
Microsoft Defender for Office 365
Email Header & Mail-Flow Analysis
SPF, DKIM & DMARC
Troubleshooting & Root Cause Analysis
PowerShell / Security Automation
Technical Documentation
Cross-functional Collaboration
Please note at this time we are unable to proceed with candidates who require visa sponsorship now or in the future.
Location and Workplace Flexibility
Zelis is headquartered in the U.S., with multiple locations across the country and in Hyderabad, India. Check out our <a target="_blank"