Magento 2.3 contact form not sending emails( No log entry).

app/code/Magento/Email/Model/Transport.php

@@ -8,13 +8,15 @@
 namespace Magento\Email\Model;
 
 use Magento\Framework\App\Config\ScopeConfigInterface;
+use Magento\Framework\App\ObjectManager;
 use Magento\Framework\Exception\MailException;
 use Magento\Framework\Mail\MessageInterface;
 use Magento\Framework\Mail\TransportInterface;
 use Magento\Framework\Phrase;
 use Magento\Store\Model\ScopeInterface;
 use Laminas\Mail\Message;
 use Laminas\Mail\Transport\Sendmail;
+use Psr\Log\LoggerInterface;
 
 /**
  * Class that responsible for filling some message data before transporting it.
@@ -60,15 +62,22 @@ class Transport implements TransportInterface
      */
     private $message;
 
+    /**
+     * @var LoggerInterface|null
+     */
+    private $logger;
+
     /**
      * @param MessageInterface $message Email message object
      * @param ScopeConfigInterface $scopeConfig Core store config
      * @param null|string|array|\Traversable $parameters Config options for sendmail parameters
+     * @param LoggerInterface|null $logger
      */
     public function __construct(
         MessageInterface $message,
         ScopeConfigInterface $scopeConfig,
-        $parameters = null
+        $parameters = null,
+        LoggerInterface $logger = null
     ) {
         $this->isSetReturnPath = (int) $scopeConfig->getValue(
             self::XML_PATH_SENDING_SET_RETURN_PATH,
@@ -81,6 +90,7 @@ public function __construct(
 
         $this->laminasTransport = new Sendmail($parameters);
         $this->message = $message;
+        $this->logger = $logger ?: ObjectManager::getInstance()->get(LoggerInterface::class);
     }
 
     /**
@@ -100,7 +110,8 @@ public function sendMessage()
 
             $this->laminasTransport->send($laminasMessage);
         } catch (\Exception $e) {
-            throw new MailException(new Phrase($e->getMessage()), $e);
+            $this->logger->error($e);
+            throw new MailException(new Phrase('Unable to send mail. Please try again later.'));
         }
     }
 

app/code/Magento/Email/Test/Unit/Model/TransportTest.php

@@ -0,0 +1,72 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Email\Test\Unit\Model;
+
+use Laminas\Mail\Transport\Exception\RuntimeException;
+use Magento\Email\Model\Transport;
+use Magento\Framework\App\Config\ScopeConfigInterface;
+use Magento\Framework\Mail\Message;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Tests for email transport functionality.
+ */
+class TransportTest extends TestCase
+{
+    /**
+     * @var MockObject|LoggerInterface
+     */
+    private $loggerMock;
+
+    /**
+     * @var Transport
+     */
+    private $transport;
+
+    /**
+     * @var ScopeConfigInterface|MockObject
+     */
+    private $scopeConfigMock;
+
+    /**
+     * @inheridoc
+     */
+    protected function setUp(): void
+    {
+        $this->loggerMock = $this->getMockBuilder(LoggerInterface::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['error'])
+            ->getMockForAbstractClass();
+        $this->scopeConfigMock = $this->getMockBuilder(ScopeConfigInterface::class)
+            ->disableOriginalConstructor()
+            ->getMockForAbstractClass();
+        $this->transport = new Transport(
+            new Message(),
+            $this->scopeConfigMock,
+            null,
+            $this->loggerMock
+        );
+    }
+
+    /**
+     * Verify exception is properly handled in case one occurred when message sent.
+     *
+     * @return void
+     */
+    public function testSendMessageBrokenMessage(): void
+    {
+        $exception = new RuntimeException('Invalid email; contains no at least one of "To", "Cc", and "Bcc" header');
+        $this->loggerMock->expects(self::once())->method('error')->with($exception);
+        $this->expectException('Magento\Framework\Exception\MailException');
+        $this->expectExceptionMessage('Unable to send mail. Please try again later.');
+
+        $this->transport->sendMessage();
+    }
+}

app/code/Magento/Email/i18n/en_US.csv

@@ -98,3 +98,4 @@ Action,Action
 "Email template chosen based on theme fallback, when the ""Default"" option is selected.","Email template chosen based on theme fallback, when the ""Default"" option is selected."
 "Header Template","Header Template"
 "Footer Template","Footer Template"
+"Unable to send mail. Please try again later.","Unable to send mail. Please try again later."

lib/internal/Magento/Framework/Mail/Test/Unit/TransportTest.php

@@ -7,23 +7,57 @@
 
 namespace Magento\Framework\Mail\Test\Unit;
 
+use Laminas\Mail\Transport\Exception\RuntimeException;
 use Magento\Framework\Mail\Message;
 use Magento\Framework\Mail\Transport;
+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
 
+/**
+ * Provides tests for framework email transport functionality.
+ */
 class TransportTest extends TestCase
 {
     /**
+     * @var MockObject|LoggerInterface
+     */
+    private $loggerMock;
+
+    /**
+     * @var Transport
+     */
+    private $transport;
+
+    /**
+     * @inheridoc
+     */
+    protected function setUp(): void
+    {
+        $this->loggerMock = $this->getMockBuilder(LoggerInterface::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['error'])
+            ->getMockForAbstractClass();
+        $this->transport = new Transport(
+            new Message(),
+            null,
+            $this->loggerMock
+        );
+    }
+
+    /**
+     * Verify exception is properly handled in case one occurred when message sent.
+     *
      * @covers \Magento\Framework\Mail\Transport::sendMessage
+     * @return void
      */
-    public function testSendMessageBrokenMessage()
+    public function testSendMessageBrokenMessage(): void
     {
+        $exception = new RuntimeException('Invalid email; contains no at least one of "To", "Cc", and "Bcc" header');
+        $this->loggerMock->expects(self::once())->method('error')->with($exception);
         $this->expectException('Magento\Framework\Exception\MailException');
-        $this->expectExceptionMessage('Invalid email; contains no at least one of "To", "Cc", and "Bcc" header');
-        $transport = new Transport(
-            new Message()
-        );
+        $this->expectExceptionMessage('Unable to send mail. Please try again later.');
 
-        $transport->sendMessage();
+        $this->transport->sendMessage();
     }
 }

lib/internal/Magento/Framework/Mail/Transport.php

@@ -3,17 +3,21 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Mail;
 
+use Magento\Framework\App\ObjectManager;
 use Magento\Framework\Exception\MailException;
 use Magento\Framework\Phrase;
 use Laminas\Mail\Message as LaminasMessage;
 use Laminas\Mail\Transport\Sendmail;
+use Psr\Log\LoggerInterface;
 
 /**
  * Mail transport
  */
-class Transport implements \Magento\Framework\Mail\TransportInterface
+class Transport implements TransportInterface
 {
     /**
      * @var Sendmail
@@ -25,14 +29,21 @@ class Transport implements \Magento\Framework\Mail\TransportInterface
      */
     private $message;
 
+    /**
+     * @var LoggerInterface|null
+     */
+    private $logger;
+
     /**
      * @param MessageInterface $message
      * @param null|string|array|\Traversable $parameters
+     * @param LoggerInterface|null $logger
      */
-    public function __construct(MessageInterface $message, $parameters = null)
+    public function __construct(MessageInterface $message, $parameters = null, LoggerInterface $logger = null)
     {
         $this->laminasTransport = new Sendmail($parameters);
         $this->message = $message;
+        $this->logger = $logger ?: ObjectManager::getInstance()->get(LoggerInterface::class);
     }
 
     /**
@@ -45,7 +56,8 @@ public function sendMessage()
                 LaminasMessage::fromString($this->message->getRawMessage())
             );
         } catch (\Exception $e) {
-            throw new MailException(new Phrase($e->getMessage()), $e);
+            $this->logger->error($e);
+            throw new MailException(new Phrase('Unable to send mail. Please try again later.'));
         }
     }