Initial commit: Postfix mail server with SES relay

- Containerized Postfix configuration for mailing list management
- Environment-based configuration for SES credentials
- Template-based config generation for flexibility
- Static virtual aliases (Phase 1)
- Prepared for future web interface and SQL backend (Phase 2+)

Features:
- Docker Compose orchestration
- Secure credential management via .env
- Configurable SMTP host/port
- Git-ignored sensitive files
- Comprehensive documentation

.env.example

@@ -0,0 +1,11 @@
+# SES/SMTP Configuration
+# Copy this file to .env and fill in your actual credentials
+
+# Required: Your AWS SES credentials
+SES_USER=your_ses_access_key_id
+SES_PASS=your_ses_secret_access_key
+
+# Optional: SMTP server configuration
+# Default is EU West 2 - change if using different region
+SMTP_HOST=email-smtp.eu-west-2.amazonaws.com
+SMTP_PORT=587