FIX Don't break the page if password recover email fails to send

lang/en.yml

@@ -290,6 +290,7 @@ en:
     CURRENT_PASSWORD: 'Current Password'
     EDIT_PASSWORD: 'New Password'
     EMAIL: Email
+    EMAIL_FAILED: 'There was an error when trying to email you a password reset link.'
     EMPTYNEWPASSWORD: "The new password can't be empty, please try again"
     ENTEREMAIL: 'Please enter an email address to get a password reset link.'
     ERRORLOCKEDOUT2: 'Your account has been temporarily disabled because of too many failed attempts at logging in. Please try again in {count} minutes.'

src/Security/MemberAuthenticator/LostPasswordHandler.php

@@ -2,15 +2,19 @@
 
 namespace SilverStripe\Security\MemberAuthenticator;
 
+use Psr\Log\LoggerInterface;
 use SilverStripe\Control\Controller;
 use SilverStripe\Control\Email\Email;
 use SilverStripe\Control\HTTPResponse;
 use SilverStripe\Control\RequestHandler;
 use SilverStripe\Core\Convert;
+use SilverStripe\Core\Injector\Injector;
 use SilverStripe\Forms\Form;
 use SilverStripe\ORM\FieldType\DBField;
 use SilverStripe\Security\Member;
 use SilverStripe\Security\Security;
+use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
+use Symfony\Component\Mime\Exception\RfcComplianceException;
 
 /**
  * Handle login requests from MemberLoginForm
@@ -173,7 +177,18 @@ class LostPasswordHandler extends RequestHandler
         if ($member) {
             $token = $member->generateAutologinTokenAndStoreHash();
 
-            $this->sendEmail($member, $token);
+            $success = $this->sendEmail($member, $token);
+            if (!$success) {
+                $form->sessionMessage(
+                    _t(
+                        Member::class . '.EMAIL_FAILED',
+                        'There was an error when trying to email you a password reset link.'
+                    ),
+                    'bad'
+                );
+
+                return $this->redirectToLostPassword();
+            }
         }
 
         return $this->redirectToSuccess($data);
@@ -225,6 +240,7 @@ class LostPasswordHandler extends RequestHandler
      */
     protected function sendEmail($member, $token)
     {
+        try {
             /** @var Email $email */
             $email = Email::create()
                 ->setHTMLTemplate('SilverStripe\\Control\\Email\\ForgotPasswordEmail')
@@ -238,7 +254,14 @@ class LostPasswordHandler extends RequestHandler
                 ->setTo($member->Email);
 
             $member->extend('updateForgotPasswordEmail', $email);
-        return $email->send();
+            $email->send();
+            return true;
+        } catch (TransportExceptionInterface | RfcComplianceException $e) {
+            /** @var LoggerInterface $logger */
+            $logger = Injector::inst()->get(LoggerInterface::class . '.errorhandler');
+            $logger->error('Error sending email in ' . __FILE__ . ' line ' . __LINE__ . ": {$e->getMessage()}");
+            return false;
+        }
     }
 
     /**