every time I submit my answers I get several "attempts" and this;
Swift_TransportException
Failed to authenticate on SMTP server with username "courses@addictionacademy.com" using 2 possible authenticators 
/var/www/gatehouse/protected/extensions/yii-mail/vendors/swiftMailer/classes/Swift/Transport/Esmtp/AuthHandler.php(179)
167       foreach ($this->_getAuthenticatorsForAgent() as $authenticator)
168       {
169         if (in_array(strtolower($authenticator->getAuthKeyword()),
170           array_map('strtolower', $this->_esmtpParams)))
171         {
172           $count++;
173           if ($authenticator->authenticate($agent, $this->_username, $this->_password))
174           {
175             return;
176           }
177         }
178       }
179       throw new Swift_TransportException(
180         'Failed to authenticate on SMTP server with username "' .
181         $this->_username . '" using ' . $count . ' possible authenticators'
182         );
183     }
184   }
185   
186   /**
187    * Not used.
188    */
189   public function getMailParams()
190   {
191     return array();
Stack Trace
#0 
–  /var/www/gatehouse/protected/extensions/yii-mail/vendors/swiftMailer/classes/Swift/Transport/EsmtpTransport.php(252): Swift_Transport_Esmtp_AuthHandler->afterEhlo(Swift_SmtpTransport) 
247 
248     $this->_capabilities = $this->_getCapabilities($response);
249     $this->_setHandlerParams();
250     foreach ($this->_getActiveHandlers() as $handler)
251     {
252       $handler->afterEhlo($this);
253     }
254   }
255   
256   /** Overridden to add Extension support */
257   protected function _doMailFromCommand($address)
#1 
–  /var/www/gatehouse/protected/extensions/yii-mail/vendors/swiftMailer/classes/Swift/Transport/AbstractSmtpTransport.php(108): Swift_Transport_EsmtpTransport->_doHeloCommand() 
103       catch (Swift_TransportException $e)
104       {
105         $this->_throwException($e);
106       }
107       $this->_readGreeting();
108       $this->_doHeloCommand();
109       
110       if ($evt)
111       {
112         $this->_eventDispatcher->dispatchEvent($evt, 'transportStarted');
113       }
#2 
–  /var/www/gatehouse/protected/extensions/yii-mail/vendors/swiftMailer/classes/Swift/Mailer.php(74): Swift_Transport_AbstractSmtpTransport->start() 
69   {
70     $failedRecipients = (array) $failedRecipients;
71     
72     if (!$this->_transport->isStarted())
73     {
74       $this->_transport->start();
75     }
76     
77     return $this->_transport->send($message, $failedRecipients);
78   }
79   
#3 
+  /var/www/gatehouse/protected/extensions/yii-mail/YiiMail.php(133): Swift_Mailer->send(Swift_Message, array()) 

#4 
+  /var/www/gatehouse/protected/components/Controller.php(54): YiiMail->send(YiiMailMessage) 

#5 
+  /var/www/gatehouse/protected/controllers/CourseController.php(360): Controller->SendMail("mrssummerdoran@gmail.com", "Training Course Completion Notification", "course_completion", array(Course, "93", "September 25, 2019, 12:40 pm")) 

#6 
 unknown(0): CourseController->actionExam("5") 
#7 
+  /var/framework/web/actions/CAction.php(108): ReflectionMethod->invokeArgs(CourseController, array("5")) 

#8 
+  /var/framework/web/actions/CInlineAction.php(47): CAction->runWithParamsInternal(CourseController, ReflectionMethod, array("id" => "5")) 

#9 
+  /var/framework/web/CController.php(308): CInlineAction->runWithParams(array("id" => "5")) 

#10 
+  /var/framework/web/filters/CFilterChain.php(133): CController->runAction(CInlineAction) 

#11 
+  /var/framework/web/filters/CFilter.php(40): CFilterChain->run() 

#12 
+  /var/framework/web/CController.php(1145): CFilter->filter(CFilterChain) 

#13 
+  /var/framework/web/filters/CInlineFilter.php(58): CController->filterAccessControl(CFilterChain) 

#14 
+  /var/framework/web/filters/CFilterChain.php(130): CInlineFilter->filter(CFilterChain) 

#15 
+  /var/framework/web/CController.php(291): CFilterChain->run() 

#16 
+  /var/framework/web/CController.php(265): CController->runActionWithFilters(CInlineAction, array("accessControl", array("ext.booster.filters.BootstrapFilter - view,index,category,exam,r..."))) 

#17 
+  /var/framework/web/CWebApplication.php(282): CController->run("exam") 

#18 
+  /var/framework/web/CWebApplication.php(141): CWebApplication->runController("course/exam") 

#19 
+  /var/framework/base/CApplication.php(169): CWebApplication->processRequest() 

#20 
+  /var/www/gatehouse/index.php(13): CApplication->run() 

2019-09-25 12:40:55 Apache/2.4.7 (Ubuntu) Yii Framework/1.1.13 