Index: tests/phpunit/tests/mail.php
===================================================================
--- tests/phpunit/tests/mail.php	(revision 37269)
+++ tests/phpunit/tests/mail.php	(working copy)
@@ -9,6 +9,11 @@
 		unset( $GLOBALS['phpmailer']->mock_sent );
 	}
 
+	function tearDown() {
+		parent::setUp();
+		unset( $GLOBALS['phpmailer']->mock_sent );
+	}
+
 	/**
 	 * Send a mail with a 1000 char long line.
 	 *