Feb 13, 2020 · Feb 13, 2020
diff --git a/components/mailer.rst b/components/mailer.rst

    $dsn = 'roundrobin(postmark+api://ID@default sendgrid+smtp://KEY@default)'

 The mailer will start using the first transport and if it fails, it will retry
 the same delivery with the next transports until one of them succeeds (or until
 all of them fail).
 The mailer will start using a randomly selected transport and if it fails, it
 will retry the same delivery with the next transports until one of them succeeds
 (or until all of them fail).

 .. versionadded:: 5.1

    The random selection of the first transport was introduced in Symfony 5.1.
    In previous Symfony versions the first transport was always selected first.

 TLS Peer Verification
 ---------------------
Original file line number	Diff line number	Diff line change
Expand Up		@@ -138,9 +138,14 @@ A round-robin transport is configured with two or more transports and the

		$dsn = 'roundrobin(postmark+api://ID@default sendgrid+smtp://KEY@default)'

		The mailer will start using the first transport and if it fails, it will retry
		the same delivery with the next transports until one of them succeeds (or until
		all of them fail).
		The mailer will start using a randomly selected transport and if it fails, it
		will retry the same delivery with the next transports until one of them succeeds
		(or until all of them fail).

		.. versionadded:: 5.1

		The random selection of the first transport was introduced in Symfony 5.1.
		In previous Symfony versions the first transport was always selected first.

		TLS Peer Verification
		---------------------
Expand Down