diff --git a/docs/easycozy/config.md b/docs/easycozy/config.md
new file mode 100644
index 0000000000000000000000000000000000000000..0a525cad7e8f16377ace179d4f7327f47f325c06
--- /dev/null
+++ b/docs/easycozy/config.md
@@ -0,0 +1,48 @@
+# Easy Cozy configuration
+
+This section includes all configurations available for the stack.
+
+## Configuration File
+
+The configuration file of the stack is located at `.easy-cozy/cozystack/cozy.yml`. It can be edit in order to changes various parameters, smtp, logs ...
+
+## SMTP
+
+### Install a specific version of an app
+
+Modif the `cozy.yml` responsible for the configuration :
+
+```yml
+mail:
+  # mail noreply address - flags: --mail-noreply-address
+  noreply_address: noreply@localhost
+  noreply_name: My Cozy
+  reply_to: support@cozycloud.cc
+  # mail smtp host - flags: --mail-host
+  host: smtp.home
+  # mail smtp port - flags: --mail-port
+  port: 465
+  # mail smtp username - flags: --mail-username
+  username: {{.Env.COZY_MAIL_USERNAME}}
+  # mail smtp password - flags: --mail-password
+  password: {{.Env.COZY_MAIL_PASSWORD}}
+  # disable mail tls - flags: --mail-disable-tls
+  disable_tls: false
+  # skip the certificate validation (may be useful on localhost)
+  skip_certificate_validation: false
+```
+
+According to cozy-stack issue: https://github.com/cozy/cozy-stack/issues/2009 you might need to change above configuration with :
+
+```yml
+mail:
+  # mail smtp port - flags: --mail-port
+  port: 587
+  # disable mail tls - flags: --mail-disable-tls
+  disable_tls: true
+```
+
+After updating configuration don't forget to restart your cozy-stack :
+```bash
+docker-compose restart cozy
+```
diff --git a/mkdocs.yml b/mkdocs.yml
index c1c42eb395d8039f3a62522ec1b6c91e655cbaf0..fab28c304bbf5795c8cbe64b6891bc59a3a2d3ec 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -25,10 +25,11 @@ extra_css:
 nav:
   - Home: index.md
   - Easy Cozy:
-      - Scripts: easycozy/scripts.md
+      - Configuration: easycozy/config.md
       - Commands: easycozy/commands.md
-      - Tips: easycozy/tips.md
       - Known errors: easycozy/known_errors.md
+      - Scripts: easycozy/scripts.md
+      - Tips: easycozy/tips.md
   - Ecolyo:
       - Introduction: ecolyo/index.md
       - Getting started: