WP_Error Object
(
    [errors] => Array
        (
            [wp_mail_failed] => Array
                (
                    [0] => SMTP Error: Could not authenticate.
                )

        )

    [error_data] => Array
        (
            [wp_mail_failed] => Array
                (
                    [to] => Array
                        (
                            [0] => mayur.8189@gmail.com
                        )

                    [subject] => i am testing subject
                    [message] => i am testing message
                    [headers] => Array
                        (
                        )

                    [attachments] => Array
                        (
                        )

                    [phpmailer_exception_code] => 0
                )

        )

    [additional_data:protected] => Array
        (
        )

)