ABOUT US:

As a world leading provider of integrated solutions for the alternative investment industry, Alter Domus (meaning “The Other House” in Latin) is proud to be home to 90% of the top 30 asset managers in the private markets, and more than 6,000 professionals across 24 jurisdictions.

With a deep understanding of what it takes to succeed in alternatives, we believe in being different in what we do, how we work, and most importantly in how we enable and develop our people. Invest yourself in the alternative, and join an organization where you progress on merit, where you can speak openly with whoever you are speaking to, and where you will be supported along whichever path you choose to take.

Find out more about life at Alter Domus at careers.alterdomus.com

JOB DESCRIPTION:

Reporting to the Global Head of Security under Platform Security, the Senior Email Security Administrator plays a crucial role in leading our Email Security program. The role will own the design, implementation, and optimization of Mimecast and Proofpoint Tessian Mimecast solutions, partnering closely with IT Messaging team to ensure secure messaging delivery and to protect against phishing, malware, data loss, and business email compromise (BEC). This role requires a blend of deep technical expertise, hands on execution, and collaboration with the IT teams. The ideal candidate will have extensive hands-on experience in email security technologies, strong analytical skills, and a proactive approach to problem-solving.

Key Responsibilities:

Act as the organization’s de facto Email Security Administrator who owns the design, deployment, and ongoing operations for the organization’s Secure Email Gateways (Mimecast, Proofpoint Tessian).
Design and own the email security architecture across Mimecast, Tessian, and Microsoft 365 and Exchange Online, ensuring robust protection against threats.
Drive and own policy tuning, balancing security with favorable user experience, and work towards reducing false positives in email security systems and end-user alerts.
Serve as the primary point of contact for email and messaging security initiatives, ensuring effective communication and collaboration with Global Cyber Fusion Center Incident Response and IT Messaging/Ops teams and other stakeholders.
Regularly generate security posture and KPIs to senior management to ensure accountability.
Document runbooks and technical SOPs for process alignment and to describe technical specifications for email security infrastructure and related policies.
Assist with investigations and responses for high-severity email threats, including phishing, impersonation, and business email compromise (BEC).
Work with Global Cyber Fusion Centre Security Operations Center (SOC), IT and Compliance teams to align processes and escalation protocol.
Support audits, risk assessments, and security reviews to maintain compliance and enhance security measures.
Evaluate next generation cyber solutions related to Email and DLP.
Provide security advisory and best-practice recommendations that align with the organization’s risk profiles and business objectives.

Required Skills & Experience:

Bachelor’s degree in computer science, Information Security, or related professional experience.
7+ years of experience in Cybersecurity, with a strong focus on Email and Messaging Security.
Extensive, hands-on experience administering Mimecast, Proofpoint Tessian Secure Email Gateways as an enterprise email security administrator.
Proven experience securing Microsoft 365 and Exchange Online environments with a solid understanding of Entra ID for users and group management.
Experience in Microsoft Purview with Data Loss Prevention (DLP) and user behavior analytics is a big plus.
Strong knowledge of phishing, social engineering, and BEC threats, along with email authentication protocols (SPF, DKIM, DMARC) and encryption standards (TLS).
Familiarity with SIEM/SOAR integrations (e.g., Splunk, Sentinel, QRadar).
Relevant security certifications such as CISSP, Security+ with certifications specific to administering Secure Email Gateways (e.g., Ironport, Mimecast, Proofpoint).
Experience supporting regulated organizations ensuring compliance with industry standards. (e.g. GDPR)
Ability to collaborate with colleagues across the enterprise and to work effectively in matrixed, geographically distributed teams around the globe
Soft Skills:

- Structured mindset, strong attention to detail, and organized
- Positive attitude and outstanding, proactive problem-identification and problem-solving skills.
- Self-motivated and able to complete projects with minimal supervision.
- The ability to work under pressure, balance competing priorities, meet deadlines, and maintain operations.
- Collaborate effectively with cross-functional IT teams.

WHAT WE OFFER:

We are committed to supporting your development, advancing your career, and providing benefits that matter to you.

Our industry-leading Alter Domus Academy offers six learning zones for every stage of your career, with resources tailored to your ambitions and resources from LinkedIn Learning.

Our global benefits also include:

Support for professional accreditations
Flexible arrangements, generous holidays, plus an additional day off for your birthday!
Continuous mentoring along your career progression
Active sports, events and social committees across our offices
24/7 support available from our Employee Assistance Program
The opportunity to invest in our growth and success through our Employee Share Plan
Plus additional local benefits depending on your location

Equity in every sense of the word:

We are in the business of equity, in every sense of the word. For us, this means taking action to ensure every colleague has equal opportunity, valuing every voice and experience across our organisation, maintaining an inclusive culture where you can bring your whole self to work, and making Alter Domus a workplace where everyone feels they belong.

We celebrate our differences, and recognise that our success relies on diverse perspectives and experiences, as we work towards shared goals and a common purpose. We take pride in creating a workplace where all our people are empowered to be truly invested in the alternative and bring their whole selves to work.

We are committed to ensuring a welcomling recruiting and onboarding process for everyone. Please contact our hiring team if you require any accommodations to make our recruitment process more accessible for you. Alter Domus is an Equal Opportunity Employer: All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, or protected veteran status.

(Alter Domus Privacy notice can be reviewed via Alter Domus webpage: https://alterdomus.com/privacy-notice/)

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Senior Email Security Administrator

Benefits

Job Description