Sending mail error in laravel 5.1

i am trying to send email in laravel 5.1 but it give me folloiwng error.

Swift_TransportException in AbstractSmtpTransport.php line 383: Expected response code 250 but got code "530", with message "530-5.5.1 Authentication Required. Learn more at 530 5.5.1 http://ift.tt/2dX5gUh o1sm938569pgf.63 - gsmtp "

i have tried 2-Step verification and http://ift.tt/1oME4BN also trun on. But still getting the error

anyone can help me for that?

via Chebli Mohamed