# smtp4dev - Development SMTP Server

## Overview

smtp4dev is a fake SMTP server for development and testing. It accepts all incoming email without delivering it, capturing messages for inspection via a web UI and IMAP client. All services in the Ouranos sandbox that send email (Casdoor, Gitea, etc.) are wired to smtp4dev so email flows can be tested without a real mail server.

**Host:** Oberon (container_orchestration)  
**Web UI Port:** 22085 → `https://smtp4dev.ouranos.helu.ca`  
**SMTP Port:** 22025 (used by all services as `smtp_host:smtp_port`)  
**IMAP Port:** 22045  
**Syslog Port:** 51405 (Alloy)

## Architecture

```
┌─────────────────────────────────────────────────────────┐
│                      Oberon Host                        │
│                                                         │
│  ┌──────────────────────────────────────────────────┐  │
│  │         smtp4dev Container (Docker)              │  │
│  │                                                  │  │
│  │  Port 80  → host 22085  (Web UI)                │  │
│  │  Port 25  → host 22025  (SMTP)                  │  │
│  │  Port 143 → host 22045  (IMAP)                  │  │
│  │                                                  │  │
│  │  Volume: smtp4dev_data → /smtp4dev              │  │
│  │  Logs: syslog → Alloy:51405 → Loki             │  │
│  └──────────────────────────────────────────────────┘  │
│                                                         │
└─────────────────────────────────────────────────────────┘
          ▲                     ▲
          │ SMTP :22025          │ SMTP :22025
   ┌──────┴──────┐        ┌──────┴──────┐
   │   Casdoor   │        │    Gitea    │
   │  (Titania)  │        │  (Rosalind) │
   └─────────────┘        └─────────────┘

External access:
  https://smtp4dev.ouranos.helu.ca  →  HAProxy (Titania)  →  oberon.incus:22085
```

## Shared SMTP Variables

smtp4dev connection details are defined once in `ansible/inventory/group_vars/all/vars.yml` and consumed by all service templates:

| Variable | Value | Purpose |
|----------|-------|---------|
| `smtp_host` | `oberon.incus` | SMTP server hostname |
| `smtp_port` | `22025` | SMTP server port |
| `smtp_from` | `noreply@ouranos.helu.ca` | Default sender address |
| `smtp_from_name` | `Ouranos` | Default sender display name |

Any service that needs to send email references these shared variables rather than defining its own SMTP config. This means switching to a real SMTP server only requires changing `group_vars/all/vars.yml`.

## Ansible Deployment

### Playbook

```bash
# Deploy smtp4dev on Oberon
ansible-playbook smtp4dev/deploy.yml

# Redeploy HAProxy to activate the smtp4dev.ouranos.helu.ca backend
ansible-playbook haproxy/deploy.yml
```

### Files

| File | Purpose |
|------|---------|
| `ansible/smtp4dev/deploy.yml` | Main deployment playbook |
| `ansible/smtp4dev/docker-compose.yml.j2` | Docker Compose template |

### Deployment Steps

The `deploy.yml` playbook:

1. Filters hosts — only runs on hosts with `smtp4dev` in their `services` list (Oberon)
2. Creates `smtp4dev` system group and user
3. Adds `ponos` user to the `smtp4dev` group (for `docker compose` access)
4. Creates `/srv/smtp4dev` directory owned by `smtp4dev:smtp4dev`
5. Templates `docker-compose.yml` into `/srv/smtp4dev/`
6. Resets SSH connection to apply group membership
7. Starts the service with `community.docker.docker_compose_v2: state: present`

### Host Variables

Defined in `ansible/inventory/host_vars/oberon.incus.yml`:

```yaml
# smtp4dev Configuration
smtp4dev_user: smtp4dev
smtp4dev_group: smtp4dev
smtp4dev_directory: /srv/smtp4dev
smtp4dev_port: 22085        # Web UI (container port 80)
smtp4dev_smtp_port: 22025   # SMTP    (container port 25)
smtp4dev_imap_port: 22045   # IMAP    (container port 143)
smtp4dev_syslog_port: 51405 # Alloy syslog collector
```

## Service Integrations

### Casdoor

The Casdoor email provider is declared in `ansible/casdoor/init_data.json.j2` and seeded automatically on a **fresh** Casdoor deployment:

```json
{
  "owner": "admin",
  "name": "provider-email-smtp4dev",
  "displayName": "smtp4dev Email",
  "category": "Email",
  "type": "SMTP",
  "host": "oberon.incus",
  "port": 22025,
  "disableSsl": true,
  "fromAddress": "noreply@ouranos.helu.ca",
  "fromName": "Ouranos"
}
```

> ⚠️ For **existing** Casdoor installs, create the provider manually:
> 1. Log in to `https://id.ouranos.helu.ca` as admin
> 2. Navigate to **Identity → Providers → Add**
> 3. Set **Category**: `Email`, **Type**: `SMTP`
> 4. Fill host `oberon.incus`, port `22025`, disable SSL, from `noreply@ouranos.helu.ca`
> 5. Save and assign the provider to the `heluca` organization under **Organizations → heluca → Edit → Default email provider**

### Gitea

Configured directly in `ansible/gitea/app.ini.j2`:

```ini
[mailer]
ENABLED = true
SMTP_ADDR = {{ smtp_host }}
SMTP_PORT = {{ smtp_port }}
FROM = {{ smtp_from }}
```

Redeploy Gitea to apply:

```bash
ansible-playbook gitea/deploy.yml
```

## External Access

smtp4dev's web UI is exposed via HAProxy on Titania at `https://smtp4dev.ouranos.helu.ca`.

Backend entry in `ansible/inventory/host_vars/titania.incus.yml`:

```yaml
- subdomain: "smtp4dev"
  backend_host: "oberon.incus"
  backend_port: 22085
  health_path: "/"
```

## Verification

```bash
# Check container is running
ssh oberon.incus "cd /srv/smtp4dev && docker compose ps"

# Check logs
ssh oberon.incus "cd /srv/smtp4dev && docker compose logs --tail=50"

# Test SMTP delivery (sends a test message)
ssh oberon.incus "echo 'Subject: test' | sendmail -S oberon.incus:22025 test@example.com"

# Check web UI is reachable internally
curl -s -o /dev/null -w "%{http_code}" http://oberon.incus:22085

# Check external HTTPS route
curl -sk -o /dev/null -w "%{http_code}" https://smtp4dev.ouranos.helu.ca
```

## site.yml Order

smtp4dev is deployed after Docker (it requires the Docker engine) and before Casdoor (so the SMTP endpoint exists when Casdoor initialises):

```yaml
- name: Deploy Docker
  import_playbook: docker/deploy.yml

- name: Deploy smtp4dev
  import_playbook: smtp4dev/deploy.yml

- name: Deploy PPLG Stack     # ...continues
```