Security Engineer - Email Security
First seen by Alion on Sep 8, 2026.
About Us:
Zelis is modernizing the healthcare financial experience in the United States across payers, providers, and healthcare consumers.
Position Overview:
Zelis is seeking a Security Engineer - Email Security to support and enhance the security, reliability, and protection of our enterprise email environment.
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 environments.
- Troubleshoot email delivery, mail-flow, quarantine, filtering, and security-policy 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.
- Analyze and troubleshoot email authentication technologies including SPF, DKIM, and DMARC.
Tech Stack:
- Microsoft Exchange, Exchange Online, Microsoft 365, Microsoft Defender for Office 365, EasyDMARC, Abnormal Security, PowerShell.
Required Qualifications:
- 5+ years of proven experience designing and implementing enterprise-grade email security guardrails in regulated fintech or healthcare environments.
- 3+ years of hands-on experience with Microsoft Exchange, Exchange Online, or Microsoft 365 messaging environments.
- Strong understanding of email protocols and technologies, including SMTP, DNS, SPF, DKIM, and DMARC.
- Experience investigating phishing, spam, malware, spoofing, and business email compromise incidents.
Commitment to Diversity :
At Zelis, we champion diversity, equity, inclusion, and belonging in all aspects of our operations.
Skills
Cyber Security, IT Security Strategy, Email Infrastructure, Microsoft Defender, Office 365, Email Deliverability, Incident Management, Security Protocols