diff --git a/cookbook/email/dev_environment.rst b/cookbook/email/dev_environment.rst
index d5dbabba918..7aa9de1e257 100644
--- a/cookbook/email/dev_environment.rst
+++ b/cookbook/email/dev_environment.rst
@@ -33,14 +33,15 @@ will not be sent when you run tests, but will continue to be sent in the
     .. code-block:: xml
 
         <!-- app/config/config_test.xml -->
-
-        <!--
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <container xmlns="http://symfony.com/schema/dic/services"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
-            http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd
-        -->
+            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
 
-        <swiftmailer:config
-            disable-delivery="true" />
+            <swiftmailer:config disable-delivery="true" />
+        </container>
 
     .. code-block:: php
 
@@ -70,13 +71,15 @@ via the ``delivery_address`` option:
     .. code-block:: xml
 
         <!-- app/config/config_dev.xml -->
-
-        <!--
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <container xmlns="http://symfony.com/schema/dic/services"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
-            http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd
-        -->
+            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
 
-        <swiftmailer:config delivery-address="dev@example.com" />
+            <swiftmailer:config delivery-address="dev@example.com" />
+        </container>
 
     .. code-block:: php
 
@@ -151,16 +154,21 @@ by adding the ``delivery_whitelist`` option:
         <!-- app/config/config_dev.xml -->
 
         <?xml version="1.0" charset="UTF-8" ?>
+        <?xml version="1.0" encoding="UTF-8" ?>
         <container xmlns="http://symfony.com/schema/dic/services"
-            xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer">
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+            xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
+            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
 
-        <swiftmailer:config delivery-address="dev@example.com">
-            <!-- all email addresses matching this regex will *not* be redirected to dev@example.com -->
-            <swiftmailer:delivery-whitelist-pattern>/@specialdomain.com$/</swiftmailer:delivery-whitelist-pattern>
+            <swiftmailer:config delivery-address="dev@example.com">
+                <!-- all email addresses matching this regex will *not* be redirected to dev@example.com -->
+                <swiftmailer:delivery-whitelist-pattern>/@specialdomain.com$/</swiftmailer:delivery-whitelist-pattern>
 
-            <!-- all emails sent to admin@mydomain.com won't be redirected to dev@example.com too -->
-            <swiftmailer:delivery-whitelist-pattern>/^admin@mydomain.com$/</swiftmailer:delivery-whitelist-pattern>
-        </swiftmailer:config>
+                <!-- all emails sent to admin@mydomain.com won't be redirected to dev@example.com too -->
+                <swiftmailer:delivery-whitelist-pattern>/^admin@mydomain.com$/</swiftmailer:delivery-whitelist-pattern>
+            </swiftmailer:config>
+        </container>
 
     .. code-block:: php
 
diff --git a/cookbook/email/email.rst b/cookbook/email/email.rst
index 5db319c538a..3aa93822148 100644
--- a/cookbook/email/email.rst
+++ b/cookbook/email/email.rst
@@ -41,17 +41,20 @@ already included:
     .. code-block:: xml
 
         <!-- app/config/config.xml -->
-
-        <!--
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <container xmlns="http://symfony.com/schema/dic/services"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
-            http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd
-        -->
-
-        <swiftmailer:config
-            transport="%mailer_transport%"
-            host="%mailer_host%"
-            username="%mailer_user%"
-            password="%mailer_password%" />
+            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
+
+            <swiftmailer:config
+                transport="%mailer_transport%"
+                host="%mailer_host%"
+                username="%mailer_user%"
+                password="%mailer_password%"
+            />
+        </container>
 
     .. code-block:: php
 
diff --git a/cookbook/email/spool.rst b/cookbook/email/spool.rst
index db40c23ba44..3747f421f81 100644
--- a/cookbook/email/spool.rst
+++ b/cookbook/email/spool.rst
@@ -35,16 +35,17 @@ swiftmailer with the memory option, use the following configuration:
     .. code-block:: xml
 
         <!-- app/config/config.xml -->
-
-        <!--
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <container xmlns="http://symfony.com/schema/dic/services"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
-            http://symfony.com/schema/dic/swiftmailer
-            http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd
-        -->
+            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
 
-        <swiftmailer:config>
-             <swiftmailer:spool type="memory" />
-        </swiftmailer:config>
+            <swiftmailer:config>
+                <swiftmailer:spool type="memory" />
+            </swiftmailer:config>
+        </container>
 
     .. code-block:: php
 
@@ -73,18 +74,20 @@ In order to use the spool with a file, use the following configuration:
     .. code-block:: xml
 
         <!-- app/config/config.xml -->
-
-        <!--
+        <?xml version="1.0" encoding="UTF-8" ?>
+        <container xmlns="http://symfony.com/schema/dic/services"
+            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns:swiftmailer="http://symfony.com/schema/dic/swiftmailer"
-            http://symfony.com/schema/dic/swiftmailer
-            http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd
-        -->
-
-        <swiftmailer:config>
-             <swiftmailer:spool
-                 type="file"
-                 path="/path/to/spool" />
-        </swiftmailer:config>
+            xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd
+                http://symfony.com/schema/dic/swiftmailer http://symfony.com/schema/dic/swiftmailer/swiftmailer-1.0.xsd">
+
+            <swiftmailer:config>
+                <swiftmailer:spool
+                    type="file"
+                    path="/path/to/spool"
+                />
+            </swiftmailer:config>
+        </container>
 
     .. code-block:: php