Can anyone help me i am try to send email but i am geting the error like this

Swift_TransportException in AbstractSmtpTransport.php line 383: Expected response code 220 but got code "", with message ""

in AbstractSmtpTransport.php line 383 at Swift_Transport_AbstractSmtpTransport->_assertResponseCode('', array('220')) in AbstractSmtpTransport.php line 289 at Swift_Transport_AbstractSmtpTransport->_readGreeting() in AbstractSmtpTransport.php line 117 at Swift_Transport_AbstractSmtpTransport->start() in Mailer.php line 79 at Swift_Mailer->send(object(Swift_Message), array()) in Mailer.php line 374 at Mailer->sendSwiftMessage(object(Swift_Message)) in Mailer.php line 196 at Mailer->send(array('notifications::email', 'notifications::email-plain'), array('level' => 'info', 'subject' => null, 'greeting' => null, 'introLines' => array('You are receiving this email because we received a password reset request for your account.'), 'outroLines' => array('If you did not request a password reset, no further action is required.'), 'actionText' => 'Reset Password', 'actionUrl' => 'http://www.onbazzar.com/password/reset/4052b323ebad51fa039de52e411cac35ad9e129135e38ef7da8a8f89f033510d'), object(Closure)) in MailChannel.php line 85 at MailChannel->send(object(User), object(ResetPassword)) in ChannelManager.php line 79 at ChannelManager->sendNow(object(Collection), object(ResetPassword)) in ChannelManager.php line 43 at ChannelManager->send(object(User), object(ResetPassword)) in RoutesNotifications.php line 18 at User->notify(object(ResetPassword)) in CanResetPassword.php line 27 at User->sendPasswordResetNotification('4052b323ebad51fa039de52e411cac35ad9e129135e38ef7da8a8f89f033510d') in PasswordBroker.php line 71 at PasswordBroker->sendResetLink(array('email' => 'sudeshkumar147@gmail.com')) in SendsPasswordResetEmails.php line 35 at ForgotPasswordController->sendResetLinkEmail(object(Request)) at call_user_func_array(array(object(ForgotPasswordController), 'sendResetLinkEmail'), array(object(Request))) in Controller.php line 55 at Controller->callAction('sendResetLinkEmail', array(object(Request))) in ControllerDispatcher.php line 44 at ControllerDispatcher->dispatch(object(Route), object(ForgotPasswordController), 'sendResetLinkEmail') in Route.php line 190 at Route->runController() in Route.php line 144 at Route->run(object(Request)) in Router.php line 642 at Router->Illuminate\Routing{closure}(object(Request)) in Pipeline.php line 53 at Pipeline->Illuminate\Routing{closure}(object(Request)) in RedirectIfAuthenticated.php line 24 at RedirectIfAuthenticated->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in SubstituteBindings.php line 41 at SubstituteBindings->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in VerifyCsrfToken.php line 65 at VerifyCsrfToken->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in ShareErrorsFromSession.php line 49 at ShareErrorsFromSession->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in StartSession.php line 64 at StartSession->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in AddQueuedCookiesToResponse.php line 37 at AddQueuedCookiesToResponse->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in EncryptCookies.php line 59 at EncryptCookies->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in Pipeline.php line 104 at Pipeline->then(object(Closure)) in Router.php line 644 at Router->runRouteWithinStack(object(Route), object(Request)) in Router.php line 618 at Router->dispatchToRoute(object(Request)) in Router.php line 596 at Router->dispatch(object(Request)) in Kernel.php line 268 at Kernel->Illuminate\Foundation\Http{closure}(object(Request)) in Pipeline.php line 53 at Pipeline->Illuminate\Routing{closure}(object(Request)) in CheckForMaintenanceMode.php line 46 at CheckForMaintenanceMode->handle(object(Request), object(Closure)) in Pipeline.php line 137 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) in Pipeline.php line 33 at Pipeline->Illuminate\Routing{closure}(object(Request)) in Pipeline.php line 104 at Pipeline->then(object(Closure)) in Kernel.php line 150 at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 117 at Kernel->handle(object(Request)) in index.php line 54