DevOps Specialist: Postfix Multi-IP /24 Subnet Routing & Mautic Deployment (Ubuntu 22.04 LTS)
Budget: ₹1,500 – ₹12,500 INR
We are seeking an expert DevOps and Infrastructure Engineer to provision, harden, and configure a high-throughput mail transport layer on a dedicated Ubuntu 22.04 LTS instance. The core architecture relies entirely on a 100% open-source stack using Postfix and Mautic.
The network environment consists of a pristine, completely contiguous /24 subnet block (256 sequential IPv4 addresses) announced via BGP to our bare-metal hardware host anchor.
Scope of Work & Key Deliverables:
1. OS Hardening & Network Configuration:
o Configure Netplan/network interfaces to cleanly alias and map the entire contiguous 256-IP block.
o Harden the Ubuntu 22.04 LTS kernel, optimize network stack performance, flash BBR congestion control, and lift file-descriptor limits (nofile to 65535) to handle intensive parallel SMTP queues.
2. Postfix Multi-IP VirtualMTA Setup:
o Configure Postfix sender-dependent default transport maps to systematically distribute and rotate outbound mail across the entire 256-IP egress footprint.
o Implement a unified single-selector OpenDKIM model, bulk SPF inclusions, and standard sequential rDNS/PTR mapping string bindings across the entire /24 block.
3. Mautic Application Provisioning:
o Deploy a hardened, high-performance LEMP stack (Nginx, optimized MySQL/MariaDB for high write-throughput, and PHP-FPM) to power a headless open-source Mautic instance.
4. Telemetry & Log Streaming Setup:
o Install and configure a local Filebeat agent to parse /var/log/mail.log in real time.
o Construct the shipping pipeline to stream parsed SMTP delivery event states (Deliveries, Hard Bounces, Deferrals, and FBL/Complaints) via an external JSON payload POST request to our live application ingestion webhook.
Technical Acceptance Criteria:
• Milestone 1: Successful host node provisioning, kernel optimization, OpenSSL/LEMP setup, and a functional core Mautic installation.
• Milestone 2: Successful /24 subnet aliasing, operational Postfix transport rotation rules, verified Filebeat log-streaming delivery to our JSON webhook endpoint, and a perfect 10/10 technical setup score on Mail-Tester across the transport paths.
Project Governance Note:
• Execution Window: This project is structured under a 7+2 Day Active Buffer Lifecycle (7 days for active development, 2 days for DNS propagation monitoring and final validation testing).
• Boundaries: Campaign strategy, content optimization, and IP warmup management are strictly out of scope. Your responsibility ends at successful, verified infrastructure handoff.
• Requirements: Selected candidates must sign a standard Mutual NDA & Intellectual Property Assignment Agreement directly within the platform workroom before server root credentials or internal API payload schemas are released.
To Apply: Please demonstrate your direct experience with large-scale multi-IP Postfix transport maps, high-write database tuning for Mautic, or automated log parsing with Elastic/Filebeat structures.
The network environment consists of a pristine, completely contiguous /24 subnet block (256 sequential IPv4 addresses) announced via BGP to our bare-metal hardware host anchor.
Scope of Work & Key Deliverables:
1. OS Hardening & Network Configuration:
o Configure Netplan/network interfaces to cleanly alias and map the entire contiguous 256-IP block.
o Harden the Ubuntu 22.04 LTS kernel, optimize network stack performance, flash BBR congestion control, and lift file-descriptor limits (nofile to 65535) to handle intensive parallel SMTP queues.
2. Postfix Multi-IP VirtualMTA Setup:
o Configure Postfix sender-dependent default transport maps to systematically distribute and rotate outbound mail across the entire 256-IP egress footprint.
o Implement a unified single-selector OpenDKIM model, bulk SPF inclusions, and standard sequential rDNS/PTR mapping string bindings across the entire /24 block.
3. Mautic Application Provisioning:
o Deploy a hardened, high-performance LEMP stack (Nginx, optimized MySQL/MariaDB for high write-throughput, and PHP-FPM) to power a headless open-source Mautic instance.
4. Telemetry & Log Streaming Setup:
o Install and configure a local Filebeat agent to parse /var/log/mail.log in real time.
o Construct the shipping pipeline to stream parsed SMTP delivery event states (Deliveries, Hard Bounces, Deferrals, and FBL/Complaints) via an external JSON payload POST request to our live application ingestion webhook.
Technical Acceptance Criteria:
• Milestone 1: Successful host node provisioning, kernel optimization, OpenSSL/LEMP setup, and a functional core Mautic installation.
• Milestone 2: Successful /24 subnet aliasing, operational Postfix transport rotation rules, verified Filebeat log-streaming delivery to our JSON webhook endpoint, and a perfect 10/10 technical setup score on Mail-Tester across the transport paths.
Project Governance Note:
• Execution Window: This project is structured under a 7+2 Day Active Buffer Lifecycle (7 days for active development, 2 days for DNS propagation monitoring and final validation testing).
• Boundaries: Campaign strategy, content optimization, and IP warmup management are strictly out of scope. Your responsibility ends at successful, verified infrastructure handoff.
• Requirements: Selected candidates must sign a standard Mutual NDA & Intellectual Property Assignment Agreement directly within the platform workroom before server root credentials or internal API payload schemas are released.
To Apply: Please demonstrate your direct experience with large-scale multi-IP Postfix transport maps, high-write database tuning for Mautic, or automated log parsing with Elastic/Filebeat structures.