Index: /wp-testcase/test_includes_pluggable.php
===================================================================
--- /wp-testcase/test_includes_pluggable.php	(revision 438)
+++ /wp-testcase/test_includes_pluggable.php	(revision 439)
@@ -219,4 +219,20 @@
 		unset( $_SERVER['SERVER_NAME'] );
 	}
+
+	function test_wp_mail_to_address_no_name() {
+		$this->knownWPBug( 18463 );
+
+		$to = "<address@tld.com>";
+		$subject = "RFC2822 Testing";
+		$message = "My RFC822 Test Message";
+
+		unset($GLOBALS['phpmailer']->mock_sent);
+		$_SERVER['SERVER_NAME'] = 'example.com';
+		wp_mail( $to, $subject, $message );
+
+		$this->assertEquals('<address@tld.com>', $GLOBALS['phpmailer']->mock_sent[0]['to'][0][0]);
+		$this->assertEquals($message . "\n", $GLOBALS['phpmailer']->mock_sent[0]['body']);
+		unset( $_SERVER['SERVER_NAME'] );
+	}
 }