Index: webapp/cms/WEB-INF/data.deliver/config/config.xml
===================================================================
--- webapp/cms/WEB-INF/data.deliver/config/config.xml	(revision 43460)
+++ webapp/cms/WEB-INF/data.deliver/config/config.xml	(working copy)
@@ -168,6 +168,8 @@
   <smtp.mail.security.protocol>none</smtp.mail.security.protocol>
   <smtp.mail.user>admin</smtp.mail.user>
   <smtp.mail.password>admin</smtp.mail.password>
+  <!-- plugin.core:PLUGINS_CORE_MAIL_CONFIG_ANYCONNECTED_USER_RETURN_ALL_GROUP -->
+  <runtime.mail.massive.sending>false</runtime.mail.massive.sending>
   <!-- plugin.core:PLUGINS_CORE_MAIL_CONFIG_ADDRESS_GROUP -->
   <smtp.mail.from>cms@yourdomain.com</smtp.mail.from>
   <smtp.mail.sysadminto>admin@yourdomain.com</smtp.mail.sysadminto>
Index: webapp/cms/plugins/default-workflow/plugin.xml
===================================================================
--- webapp/cms/plugins/default-workflow/plugin.xml	(revision 43460)
+++ webapp/cms/plugins/default-workflow/plugin.xml	(working copy)
@@ -350,6 +350,10 @@
     </feature>
     
     <feature name="ametys.content.alerts.scheduler">
+        <config>
+            <param-ref id="runtime.mail.massive.sending"/>
+        </config>
+        
         <components>
             <component role="org.ametys.cms.alerts.AlertScheduler"
                        id="org.ametys.web.alerts.AlertScheduler"