Simple Mail Transfer Protocol (SMTP) Architect / SME
Posted 2 weeks ago by Experis UK
£575 Per day
Inside
Remote
Greater Lincoln Area, United Kingdom
Summary: The role of Simple Mail Transfer Protocol (SMTP) Architect / SME involves leading and supporting the detailed design and potential build of SMTP solutions, specifically focusing on Postfix and Linux environments. The position requires expertise in low-level design and documentation for Red Hat Postfix satellite MTA implementations. The role is primarily remote with occasional travel to a client site in Warwick and requires active SC clearance. The successful candidate will be responsible for ensuring secure and efficient email transfer within closed domains.
Key Responsibilities:
- Lead and support SMTP detailed design and potential build.
- Develop low-level design and build documents for Red Hat Postfix satellite MTA.
- Implement SMTP solutions focusing on on-premises deployment.
- Collaborate with infrastructure teams to ensure effective email relaying.
- Maintain security best practices in email configurations.
Key Skills:
- Strong understanding of SMTP and Message Transfer Agents.
- Experience with Dovecot and Postfix.
- Proficient in low-level design and build documentation.
- Experienced in Linux build and configuration, particularly on Broadcom VCF.
- Excellent communication and interpersonal skills.
- Strong understanding of security best practices and DNS records.
- Knowledge of mail security and validation (MX, DKIM, DMARC).
Salary (Rate): £575 per day
City: Warwick
Country: United Kingdom
Working Arrangements: remote
IR35 Status: inside IR35
Seniority Level: Senior
Industry: IT
Role Title: Simple Mail Transfer Protocol (SMTP) Architect / SME
Location: Remote - Occasional Travel to client site in Warwick.
Duration: 15/09/2025 with potential to extend and join Build team.
Clearance: Active SC / SC Eligible
Rate: £575 per day - PAYE via Umbrella Only
Role Description
Urgently required to lead/support SMTP Detailed Design and maybe build. Must have experience of Postfix. A Linux SME with knowledge of RHEL and Dovecot/Postfix with emphasis on Message Transfer Agent "satellite" configuration for on-premises deployment and operating between closed domains (i.e. no SaaS or email gateway to internet). The SME is responsible for the low level design and build documents for a Red Hat Postfix satellite MTA and to implement the solution.
Key Skills
- Strong understanding of SMTP and Message Transfer Agents
- Experience of Dovecot and Postfix
- Experienced in Low Level Design and Build documentation.
- Experienced in build and configuration on Linux within a Broadcom VCF (VMware virtual platform).
- Excellent communication and interpersonal skills.
- Strong understanding of security best practices.
- Strong understanding of DNS records and mail security and validation (MX, DKIM, DMARC)
Desirable Skills
- Experience with on-premises-based mail solutions.
- Knowledge of hybrid on-premises to SaaS mail services
- Excellent coordination and collaboration with infrastructure teams.
- Understanding of security and risk implication around email relaying.