diff --git a/src/Mailer.php b/src/Mailer.php
index a9e2b5b..2890fc7 100644
--- a/src/Mailer.php
+++ b/src/Mailer.php
@@ -8,6 +8,7 @@
 use Symfony\Component\Mailer\Transport;
 use Symfony\Component\Mailer\Transport\TransportInterface;
 use Symfony\Component\Mime\RawMessage;
+use yii1tech\mailer\transport\ArrayTransport;
 
 /**
  * @see https://symfony.com/doc/current/mailer.html
@@ -84,7 +85,11 @@ public function getTransport(): TransportInterface
                 throw new \LogicException('Either "' . get_class($this) . '::$dsn" or "' . get_class($this) . '::$transport" property should be set.');
             }
 
-            $this->_transport = Transport::fromDsn($this->dsn);
+            if ($this->dsn === 'array' || stripos($this->dsn, 'array://') !== false) {
+                $this->_transport = new ArrayTransport();
+            } else {
+                $this->_transport = Transport::fromDsn($this->dsn);
+            }
 
             return $this->_transport;
         }
diff --git a/src/transport/ArrayTransport.php b/src/transport/ArrayTransport.php
new file mode 100644
index 0000000..aca5233
--- /dev/null
+++ b/src/transport/ArrayTransport.php
@@ -0,0 +1,103 @@
+<?php
+
+namespace yii1tech\mailer\transport;
+
+use Symfony\Component\Mailer\SentMessage;
+use Symfony\Component\Mailer\Transport\AbstractTransport;
+use Symfony\Component\Mime\RawMessage;
+
+/**
+ * ArrayTransport stores incoming messages in the internal list, instead of sending them.
+ *
+ * This transport can be useful while writing unit tests.
+ *
+ * In {@see \yii1tech\mailer\Mailer::getTransport()} this transport will be created for DSN 'array' or 'array://'.
+ *
+ * @author Paul Klimov <klimov.paul@gmail.com>
+ * @since 1.0
+ */
+class ArrayTransport extends AbstractTransport
+{
+    /**
+     * @var \Symfony\Component\Mime\RawMessage[]|\Symfony\Component\Mime\Email[]|\yii1tech\mailer\TemplatedEmail[]
+     */
+    private $sentMessages = [];
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doSend(SentMessage $message): void
+    {
+        $this->sentMessages[] = $message->getOriginalMessage();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function __toString(): string
+    {
+        return 'array://';
+    }
+
+    /**
+     * @return \Symfony\Component\Mime\RawMessage[]|\Symfony\Component\Mime\Email[]|\yii1tech\mailer\TemplatedEmail[] sent messages.
+     */
+    public function getSentMessages(): array
+    {
+        return $this->sentMessages;
+    }
+
+    /**
+     * @return \Symfony\Component\Mime\RawMessage|\Symfony\Component\Mime\Email|\yii1tech\mailer\TemplatedEmail|null last sent message.
+     */
+    public function getLastSentMessage(): ?RawMessage
+    {
+        if (empty($this->sentMessages)) {
+            return null;
+        }
+
+        $sentMessages = $this->sentMessages;
+
+        return array_pop($sentMessages);
+    }
+
+    /**
+     * Clears the internal list of sent messages.
+     *
+     * @return static self reference.
+     */
+    public function clearSentMessages(): self
+    {
+        $this->sentMessages = [];
+
+        return $this;
+    }
+
+    /**
+     * Filters the internal list of sent messages according to the given callback.
+     *
+     * Callback signature:
+     *
+     * ```
+     * function (\Symfony\Component\Mailer\SentMessage $message): bool
+     * ```
+     *
+     * The callback is applied over each sent message.
+     * In case the callback returns `true` the message will be returned in result set.
+     *
+     * @param callable $filterCallback filter callback.
+     * @return \Symfony\Component\Mime\RawMessage[]|\Symfony\Component\Mime\Email[]|\yii1tech\mailer\TemplatedEmail[] sent messages.
+     */
+    public function filterSentMessages(callable $filterCallback): array
+    {
+        $result = [];
+
+        foreach ($this->sentMessages as $message) {
+            if (call_user_func($filterCallback, $message)) {
+                $result[] = $message;
+            }
+        }
+
+        return $result;
+    }
+}
\ No newline at end of file
diff --git a/tests/MailerTest.php b/tests/MailerTest.php
index 94be9bf..f7a3725 100644
--- a/tests/MailerTest.php
+++ b/tests/MailerTest.php
@@ -7,6 +7,7 @@
 use Symfony\Component\Mailer\Transport\NullTransport;
 use Yii;
 use yii1tech\mailer\Mailer;
+use yii1tech\mailer\transport\ArrayTransport;
 
 class MailerTest extends TestCase
 {
@@ -45,6 +46,24 @@ public function testCreateTransportFromCallable(): void
         $this->assertTrue($mailer->getTransport() instanceof NullTransport);
     }
 
+    public function testCreateArrayTransport(): void
+    {
+        /** @var Mailer $mailer */
+        $mailer = Yii::createComponent([
+            'class' => Mailer::class,
+            'dsn' => 'array',
+        ]);
+
+        $this->assertTrue($mailer->getTransport() instanceof ArrayTransport);
+
+        $mailer = Yii::createComponent([
+            'class' => Mailer::class,
+            'dsn' => 'array://',
+        ]);
+
+        $this->assertTrue($mailer->getTransport() instanceof ArrayTransport);
+    }
+
     public function testSetupSymfonyMailer(): void
     {
         $mailer = new Mailer();
diff --git a/tests/transport/ArrayTransportTest.php b/tests/transport/ArrayTransportTest.php
new file mode 100644
index 0000000..1103565
--- /dev/null
+++ b/tests/transport/ArrayTransportTest.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace yii1tech\mailer\test\transport;
+
+use Symfony\Component\Mime\Email;
+use Yii;
+use yii1tech\mailer\Mailer;
+use yii1tech\mailer\test\TestCase;
+use yii1tech\mailer\transport\ArrayTransport;
+
+class ArrayTransportTest extends TestCase
+{
+    public function testSend(): void
+    {
+        $transport = new ArrayTransport();
+
+        /** @var Mailer $mailer */
+        $mailer = Yii::createComponent([
+            'class' => Mailer::class,
+            'transport' => $transport,
+        ]);
+
+        $email = new Email();
+        $email->from('noreply@example.com');
+        $email->addTo('test@example.com');
+        $email->subject('Test subject');
+        $email->text('Test body');
+
+        $mailer->send($email);
+
+        $this->assertCount(1, $transport->getSentMessages());
+
+        $sentMessage = $transport->getLastSentMessage();
+        $this->assertSame('noreply@example.com', $sentMessage->getFrom()[0]->getAddress());
+
+        $messages = $transport->filterSentMessages(function (Email $message) {
+            return $message->getSubject() === 'Test subject';
+        });
+        $this->assertCount(1, $messages);
+
+        $messages = $transport->filterSentMessages(function (Email $message) {
+            return $message->getSubject() === 'Fake';
+        });
+        $this->assertCount(0, $messages);
+    }
+}
\ No newline at end of file