# Mailu Migration Summary

This document summarizes the migration from the old Kustomize-based Mailu setup to the new Helm-based setup.

## Files Removed

- `infrastructure/platform/mail/mailu/` - Complete removal of old Kustomize-based Mailu configuration
- `infrastructure/security/certificates/mailu/` - Removal of old certificate generation scripts

## Files Updated

### Infrastructure Configuration
- `infrastructure/environments/dev/k8s-manifests/kustomization.yaml` - Removed Mailu resource reference and patches
- `infrastructure/environments/prod/k8s-manifests/kustomization.yaml` - Removed Mailu resource reference and patches
- `infrastructure/platform/networking/ingress/base/ingress.yaml` - Removed Mailu-specific ingress rules and TLS entries
- `infrastructure/monitoring/signoz/README.md` - Updated to reflect Helm-based Mailu deployment
- `infrastructure/environments/common/configs/secrets.yaml` - Updated comments to reflect new service name

### Service Integration
- `infrastructure/environments/common/configs/configmap.yaml` - Updated SMTP_HOST to use new Helm service name
- `infrastructure/monitoring/signoz/signoz-values-prod.yaml` - Updated SMTP configuration to use new service name

## New Files Created

- `infrastructure/platform/mail/mailu-helm/` - New Helm-based Mailu configuration
  - `values.yaml` - Base configuration values
  - `dev/values.yaml` - Development-specific overrides
  - `prod/values.yaml` - Production-specific overrides
  - `mailu-ingress.yaml` - Sample ingress configuration for use with existing ingress
  - `README.md` - Comprehensive documentation
  - `MIGRATION_GUIDE.md` - Migration guide with rollback procedures

## Key Changes

1. **Service Names**: Changed from `mailu-smtp` to `mailu-postfix` (Helm chart service naming)
2. **Deployment Method**: Switched from Kustomize manifests to Helm chart
3. **Ingress Configuration**: Disabled built-in ingress to work with existing ingress controller
4. **Configuration**: All configurations now use Helm values files instead of individual YAML manifests

## Verification

The new configuration has been tested and verified to work with the existing ingress setup, maintaining all critical functionality while improving maintainability.