Jan 20, 2025 · Jan 17, 2025
diff --git a/mailer.rst b/mailer.rst

    This setting only works when the ``smtp://`` protocol is used.

 Binding to IPv4 or IPv6
 ~~~~~~~~~~~~~~~~~~~~~~~

 .. versionadded:: 7.3

    The option to bind to IPv4 or IPv6 or a specific IP address was introduced in Symfony 7.3.

 By default, the underlying SocketStream will bind to IPv4 or IPv6 depending on the available
 interfaces. By specifying the ``source_ip`` option, binding to either IPv4 or IPv6 can be enforced,
 or even to a specific address. To bind to IPv4, use::

    $dsn = 'smtp://smtp.example.com?source_ip=0.0.0.0';

 As per RFC2732, IPv6 addresses must be surrounded by square brackets. To bind to IPv6, use::

    $dsn = 'smtp://smtp.example.com?source_ip=[::]';

 .. note::

    This setting only works when the ``smtp://`` protocol is used.

 Overriding default SMTP authenticators
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Original file line number	Diff line number	Diff line change
Expand Up		@@ -426,6 +426,27 @@ setting the ``auto_tls`` option to ``false`` in the DSN::

		This setting only works when the ``smtp://`` protocol is used.

		Binding to IPv4 or IPv6
		~~~~~~~~~~~~~~~~~~~~~~~

		.. versionadded:: 7.3

		The option to bind to IPv4 or IPv6 or a specific IP address was introduced in Symfony 7.3.

		By default, the underlying SocketStream will bind to IPv4 or IPv6 depending on the available
		interfaces. By specifying the ``source_ip`` option, binding to either IPv4 or IPv6 can be enforced,
		or even to a specific address. To bind to IPv4, use::

		$dsn = 'smtp://smtp.example.com?source_ip=0.0.0.0';

		As per RFC2732, IPv6 addresses must be surrounded by square brackets. To bind to IPv6, use::

		$dsn = 'smtp://smtp.example.com?source_ip=[::]';

		.. note::

		This setting only works when the ``smtp://`` protocol is used.

		Overriding default SMTP authenticators
		~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Expand Down