I need a browser-based webmail solution tailored to our construction-focused B2B operation. Core functionality must include reliable email sending and receiving as well as a built-in contact management module that lets my team organise suppliers, subcontractors and clients from one screen. The system has to sit comfortably inside our existing workflow, so please plan for direct integration with our CRM software, our project-management suite and our accounting package. If you have preferred APIs or middleware for tying these together, spell that out in your approach; I’m open to using whichever stack makes maintenance easiest over the long term. Because this is strictly a webmail project, I’m not looking for mobile apps or desktop clients—just a clean, responsive web interface and the backend services to power it. IMAP/SMTP compliance, modern spam-filter hooks and an admin dashboard for user provisioning are expected, but the priority is smooth day-to-day email handling and accurate contact data syncing with the three systems mentioned above. Deliverables expected at hand-off: • Deployed webmail application with contact manager • Working connectors for CRM, project-management and accounting platforms • Administrator guide plus inline user help • Source code in our private repo and a short hand-over session If you’ve built similar B2B communications tools—especially for construction or other high-volume, transaction-heavy industries—please include a brief note on those projects and the tech stack you used.