mailu: enable central database, improve token creation task, and add migration guide

- Enabled central_database in Mailu config
- Improved API token creation task:
  * use curl -f to fail on HTTP errors
  * added explicit failed_when and changed_when conditions
- Adjusted docker-compose template spacing for readability
- Made logging level configurable (DEBUG when MODE_DEBUG is set)
- Added new documentation Move_Domain.md explaining safe procedure for migrating mailboxes to a new domain

roles/web-app-mailu/config/main.yml

@@ -7,7 +7,7 @@ features:
   css:                    false
   desktop:                true
   oidc:                   true
-  central_database:       false                   # Deactivate central database for mailu, I don't know why the database deactivation is necessary
+  central_database:       true
   logout:                 true
 server:
   domains:

roles/web-app-mailu/docs/Move_Domain.md

@@ -0,0 +1,90 @@
+# 📖 **How to Migrate Mailboxes to a New Domain in Mailu**
+
+When changing the primary email domain (e.g., from `cymais.cloud` to `infinito.nexus`), it is **not enough** to simply rename mailbox directories on disk. Mailu manages domain and user records in its internal database, and Dovecot maintains index files inside each Maildir. A blind rename will lead to login failures, rejected mail, or corrupted mail indices.
+
+This guide explains the **safe procedure** for migrating user mailboxes to a new domain.
+
+---
+
+## 🔴 Why renaming folders directly does not work
+
+* Mailu keeps **domains, users, and aliases** in the `admin_data` database. If you rename folders only, Mailu will not recognize the new accounts.
+* Dovecot generates `.dovecot.index*` and `dovecot-uidlist` files in each mailbox. These must be rebuilt when moving mailboxes; otherwise, users may see missing or broken mail.
+* Postfix will refuse to deliver or relay messages for unknown domains.
+
+---
+
+## ✅ Correct migration procedure
+
+### 1. Add the new domain and users in Mailu
+
+Use the Mailu CLI inside the `admin` container:
+
+```bash
+# Add new domain
+docker compose exec admin flask mailu domain add infinito.nexus
+
+# Add new user (repeat for each account)
+docker compose exec admin flask mailu user kevinveenbirkenbach infinito.nexus 'NEW_PASSWORD'
+```
+
+---
+
+### 2. Copy or move existing Maildir contents
+
+Instead of renaming, copy the entire Maildir from the old domain to the new one:
+
+```bash
+rsync -aHAX --numeric-ids \
+  /var/lib/docker/volumes/mailu_dovecot_mail/_data/kevinveenbirkenbach@cymais.cloud/ \
+  /var/lib/docker/volumes/mailu_dovecot_mail/_data/kevinveenbirkenbach@infinito.nexus/
+```
+
+---
+
+### 3. Remove old Dovecot index files
+
+Ensure that Dovecot rebuilds indices cleanly:
+
+```bash
+find /var/lib/docker/volumes/mailu_dovecot_mail/_data/kevinveenbirkenbach@infinito.nexus -type f -name '.dovecot*' -delete
+find /var/lib/docker/volumes/mailu_dovecot_mail/_data/kevinveenbirkenbach@infinito.nexus -type f -name 'dovecot-uidlist*' -delete
+```
+
+---
+
+### 4. Fix file permissions
+
+Make sure all mailbox files belong to the `mail:mail` user/group:
+
+```bash
+chown -R mail:mail /var/lib/docker/volumes/mailu_dovecot_mail/_data/kevinveenbirkenbach@infinito.nexus
+```
+
+---
+
+### 5. Restart services and test login
+
+After copying, restart Mailu services (or at least `imap` and `smtp`) and confirm that users can log in with their new addresses.
+
+---
+
+### 6. (Optional) Keep the old domain as an alias
+
+To ensure incoming mail for the old domain is still accepted:
+
+```bash
+docker compose exec admin flask mailu domain alias cymais.cloud infinito.nexus
+```
+
+This maps all `@cymais.cloud` addresses to their equivalents under `@infinito.nexus`.
+
+---
+
+## 💡 Summary
+
+* Do **not** just rename mailbox folders.
+* Always create the new domain and user in Mailu first.
+* Copy existing Maildir contents into the new user’s directory.
+* Remove Dovecot indices and fix permissions.
+* Optionally configure a **domain alias** so old addresses remain valid.

roles/web-app-mailu/tasks/03_create-token.yml

@@ -38,20 +38,28 @@
 
 - name: "Create API token for '{{ mailu_user_key }};{{ mailu_user_name }}' if no local token defined"
   command: >-
-    docker compose exec -T admin \
-      curl -s -X POST {{ mailu_api_base_url }}/token \
-        -H "Authorization: Bearer {{ MAILU_API_TOKEN }}" \
-        -H "Content-Type: application/json" \
-        -d '{{ {
-              "comment": mailu_user_key ~ " - ansible.infinito",
-              "email": users[mailu_user_key].email,
-              "ip": mailu_token_ip
-            } | to_json }}'
+    docker compose exec -T admin
+    curl -sS -f -X POST {{ mailu_api_base_url }}/token
+      -H "Authorization: Bearer {{ MAILU_API_TOKEN }}"
+      -H "Content-Type: application/json"
+      -d '{{ {
+            "comment": mailu_user_key ~ " - ansible.infinito",
+            "email": users[mailu_user_key].email,
+            "ip": mailu_token_ip
+          } | to_json }}'
   args:
     chdir: "{{ MAILU_DOCKER_DIR }}"
   when: users[mailu_user_key].mailu_token is not defined
   register: mailu_token_creation
-  changed_when: mailu_token_creation.rc == 0
+  # If curl sees 4xx/5xx it returns non-zero due to -f → fail the task.
+  failed_when:
+    - mailu_token_creation.rc != 0
+    # Fallback: if some gateway returns 200 but embeds an error JSON.
+    - mailu_token_creation.rc == 0 and
+      (mailu_token_creation.stdout is search('"code"\\s*:\\s*4\\d\\d') or
+       mailu_token_creation.stdout is search('cannot be found'))
+  # Only mark changed when a token is actually present in the JSON.
+  changed_when: mailu_token_creation.stdout is search('"token"\\s*:')
   no_log: "{{ MASK_CREDENTIALS_IN_LOGS | bool }}"
 
 - name: "Set mailu_token for '{{ mailu_user_key }};{{ mailu_user_name }}' in users dict if newly created"

roles/web-app-mailu/templates/docker-compose.yml.j2

@@ -23,7 +23,7 @@
       - "{{ MAILU_IP4_PUBLIC }}:993:993"
       - "{{ MAILU_IP4_PUBLIC }}:4190:4190"
     volumes:
-      - "{{docker_compose.directories.volumes}}overrides/nginx:/overrides:ro"
+      - "{{ docker_compose.directories.volumes }}overrides/nginx:/overrides:ro"
       - "{{ cert_mount_directory }}:/certs:ro"
 {% include 'roles/docker-container/templates/depends_on/dmbs_incl.yml.j2' %}
       resolver:
@@ -56,7 +56,7 @@
 {% include 'roles/docker-container/templates/base.yml.j2' %}
     volumes:
       - "dovecot_mail:/mail"
-      - "{{docker_compose.directories.volumes}}overrides:/overrides:ro"
+      - "{{ docker_compose.directories.volumes }}overrides:/overrides:ro"
     depends_on:
       - front
       - resolver
@@ -69,7 +69,7 @@
     image: {{ MAILU_DOCKER_FLAVOR }}/postfix:{{ MAILU_VERSION }}
 {% include 'roles/docker-container/templates/base.yml.j2' %}
     volumes:
-      - "{{docker_compose.directories.volumes}}overrides:/overrides:ro"
+      - "{{ docker_compose.directories.volumes }}overrides:/overrides:ro"
       - "smtp_queue:/queue"
     depends_on:
       - front
@@ -97,7 +97,7 @@
     volumes:
       - "filter:/var/lib/rspamd"
       - "dkim:/dkim"
-      - "{{docker_compose.directories.volumes}}overrides/rspamd:/overrides:ro"
+      - "{{ docker_compose.directories.volumes }}overrides/rspamd:/overrides:ro"
     depends_on:
       - front
       - redis
@@ -156,7 +156,7 @@
 {% include 'roles/docker-container/templates/base.yml.j2' %}
     volumes:
       - "webmail_data:/data"
-      - "{{docker_compose.directories.volumes}}overrides:/overrides:ro"
+      - "{{ docker_compose.directories.volumes }}overrides:/overrides:ro"
     depends_on:
       - imap
       - front

roles/web-app-mailu/templates/env.j2

@@ -136,7 +136,7 @@ REAL_IP_FROM=
 REJECT_UNLISTED_RECIPIENT=
 
 # Log level threshold in start.py (value: CRITICAL, ERROR, WARNING, INFO, DEBUG, NOTSET)
-LOG_LEVEL=WARNING
+LOG_LEVEL={{ 'DEBUG' if MODE_DEBUG else 'WARNING' }}
 
 ###################################
 # Database settings