Transactional Email Architecture – Decision & Implementation Framework
1. Context and Objective
2. Key Decision Drivers
3. Architectural Options and Reasoning
Option A – Direct Use of AWS SES
Option B – Postfix Relay to SES
Option C – Postal as Control Plane with SES as Delivery Layer
Option D – SaaS Transactional Providers (Mailgun, Postmark, SendGrid)
4. Decision Considerations and Trade-Offs
5. Architectural Principles
6. Cost and Sustainability Perspective
7. Strategic Recommendation