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+.. index::
+   single: Notifier
+
+Notifier
+========================
+
+Sends notifications via one or more channels (email, SMS, Slack, Telegram, ...)
+
+
+Installation
+------------
+
+First, run this command to install the notifier before using it:
+
+.. code-block:: terminal
+
+    $ composer require symfony/notifier
+
+
+Usage
+------------
+