symfony
diff --git a/‎src/Symfony/Component/Mime/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Mime/ExternalTemplatedEmail.php
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diff --git a/‎src/Symfony/Component/Mime/Tests/ExternalTemplatedEmailTest.php
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@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+7.3
+---
+  * Add `ExternalTemplatedEmail`
+
+
 7.0
 ---
 
 
@@ -0,0 +1,95 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime;
+
+use Symfony\Component\Mime\Exception\LogicException;
+
+class ExternalTemplatedEmail extends Email
+{
+    private ?string $templateId = null;
+    private array $context = [];
+    private ?string $locale = null;
+
+    public function ensureValidity(): void
+    {
+        if (null === $this->getTemplateId()) {
+            throw new LogicException('The template ID is required.');
+        }
+
+        if ('1' === $this->getHeaders()->getHeaderBody('X-Unsent')) {
+            throw new LogicException('Cannot send messages marked as "draft".');
+        }
+
+        Message::ensureValidity();
+    }
+
+    public function templateId(?string $templateId): static
+    {
+        $this->templateId = $templateId;
+
+        return $this;
+    }
+
+    public function getTemplateId(): ?string
+    {
+        return $this->templateId;
+    }
+
+    /**
+     * @return $this
+     */
+    public function locale(?string $locale): static
+    {
+        $this->locale = $locale;
+
+        return $this;
+    }
+
+    public function getLocale(): ?string
+    {
+        return $this->locale;
+    }
+
+    /**
+     * @return $this
+     */
+    public function context(array $context): static
+    {
+        $this->context = $context;
+
+        return $this;
+    }
+
+    public function getContext(): array
+    {
+        return $this->context;
+    }
+
+    /**
+     * @internal
+     */
+    public function __serialize(): array
+    {
+        return [$this->context, parent::__serialize(), $this->locale];
+    }
+
+    /**
+     * @internal
+     */
+    public function __unserialize(array $data): void
+    {
+        [$this->context, $parentData] = $data;
+        $this->locale = $data[2] ?? null;
+
+        parent::__unserialize($parentData);
+    }
+}
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Mime\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Mime\ExternalTemplatedEmail;
+
+class ExternalTemplatedEmailTest extends TestCase
+{
+    public function testTemplateId()
+    {
+        $e = new ExternalTemplatedEmail();
+        $e->templateId('template_id');
+        $this->assertEquals('template_id', $e->getTemplateId());
+    }
+
+    public function testContext()
+    {
+        $e = new ExternalTemplatedEmail();
+        $e->context(['foo' => 'bar']);
+        $this->assertEquals(['foo' => 'bar'], $e->getContext());
+    }
+
+    public function testLocale()
+    {
+        $e = new ExternalTemplatedEmail();
+        $e->locale('fr');
+        $this->assertEquals('fr', $e->getLocale());
+    }
+
+    public function testInvalidTemplateIdExternalTemplatedEmail()
+    {
+        $this->expectException(\LogicException::class);
+        $this->expectExceptionMessage('The template ID is required.');
+
+        (new ExternalTemplatedEmail())->ensureValidity();
+    }
+}