#0 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(62): Swift_Transport_StreamBuffer->_establishSocketConnection()
#1 src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(113): Swift_Transport_StreamBuffer->initialize(Array)
#2 src/XF/Mail/Mailer.php(274): Swift_Transport_AbstractSmtpTransport->start()
#3 src/XF/Mail/Mail.php(395): XF\Mail\Mailer->send(Object(Swift_Message), NULL, NULL, true)
#4 src/XF/Service/User/AbstractConfirmationService.php(85): XF\Mail\Mail->send()
#5 src/XF/Service/User/AbstractConfirmationService.php(63): XF\Service\User\AbstractConfirmationService->sendConfirmationEmail()
#6 src/XF/Service/User/Registration.php(369): XF\Service\User\AbstractConfirmationService->triggerConfirmation()
#7 src/XF/Service/User/Registration.php(291): XF\Service\User\Registration->sendRegistrationContact()
#8 src/XF/Service/ValidateAndSavableTrait.php(40): XF\Service\User\Registration->_save()
#9 src/XF/Pub/Controller/Register.php(419): XF\Service\User\Registration->save()
#10 src/XF/Mvc/Dispatcher.php(321): XF\Pub\Controller\Register->actionRegister(Object(XF\Mvc\ParameterBag))
#11 src/XF/Mvc/Dispatcher.php(249): XF\Mvc\Dispatcher->dispatchClass('XF:Register', 'register', Object(XF\Mvc\RouteMatch), Object(XF\Pub\Controller\Register), NULL)
#12 src/XF/Mvc/Dispatcher.php(100): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(XF\Pub\Controller\Register), NULL)
#13 src/XF/Mvc/Dispatcher.php(50): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#14 src/XF/App.php(2177): XF\Mvc\Dispatcher->run()
#15 src/XF.php(390): XF\App->run()
#16 index.php(20): XF::runApp('XF\\Pub\\App')
#17 {main}