Senior Messaging Engineer - 3rd line - Exchange/Email Security

Job Title: Senior Messaging Engineer – 3rd line – Exchange / Email Security Location: Hybrid – 2 days per week onsite in London or Leeds Salary/Rate: Up to £250/day INSIDE IR35 Start Date: ASAP Job Type: 9 month contract – very likely to extend Company: Financial Services/Banking client We are hiring for an SC Cleared Senior Messaging Engineer with strong third-line support experience, deep expertise in Exchange / email security, and the ability to design, improve, and stabilize complex messaging environments. Key Responsibilities * Implement, support, and enhance enterprise messaging and email security solutions * Provide third-line support for messaging-related incidents and escalations * Manage and improve Exchange Online and Exchange Hybrid environments * Support and administer secure email gateways and encryption technologies * Troubleshoot complex messaging issues and drive root-cause resolution * Lead and contribute to initiatives aimed at simplifying and modernising email estates * Mentor junior engineers and support first- and second-line teams * Produce clear technical and user documentation * Work across multiple workstreams, balancing competing priorities and deadlines Essential Skills & Experience * Strong experience with Exchange Online and Exchange Hybrid * Proven background supporting secure enterprise messaging in complex environments * Hands-on experience with email security gateways and encryption technologies * Strong PowerShell scripting and automation skills * Excellent troubleshooting and problem-solving abilities * Strong written and verbal communication skills * Experience mentoring and knowledge-sharing with wider support teams Desirable Experience * Experience with Mimecast and/or Clearswift * Knowledge of email DNS and authentication (SPF, DKIM, DMARC, MX records) * Experience with email encryption (PGP, TLS, PME) * Exposure to email journaling and archiving solutions (e.g. Enterprise Vault) * Experience migrating complex messaging environments to Exchange Online * Familiarity with Agile delivery and sprint-based working * Knowledge of ITIL processes (Incident, Problem, Change) Apply now for immediate consideration