diff --git a/src/Mail/Dto/MailSyncReport.php b/src/Mail/Dto/MailSyncReport.php
new file mode 100644
index 0000000..cee124b
--- /dev/null
+++ b/src/Mail/Dto/MailSyncReport.php
@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mail\Dto;
+
+use DateTimeImmutable;
+
+final readonly class MailSyncReport
+{
+    /**
+     * @param list<string> $errors
+     */
+    public function __construct(
+        public int $createdCount,
+        public int $updatedCount,
+        public int $deletedCount,
+        public int $foldersScanned,
+        public array $errors,
+        public float $durationSeconds,
+        public DateTimeImmutable $startedAt,
+        public DateTimeImmutable $finishedAt,
+    ) {}
+}
diff --git a/tests/Unit/Mail/MailSyncReportTest.php b/tests/Unit/Mail/MailSyncReportTest.php
new file mode 100644
index 0000000..bea5283
--- /dev/null
+++ b/tests/Unit/Mail/MailSyncReportTest.php
@@ -0,0 +1,58 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Unit\Mail;
+
+use App\Mail\Dto\MailSyncReport;
+use DateTimeImmutable;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @internal
+ */
+class MailSyncReportTest extends TestCase
+{
+    public function testInstantiationWithDefaults(): void
+    {
+        $start  = new DateTimeImmutable('2026-01-01 10:00:00');
+        $finish = new DateTimeImmutable('2026-01-01 10:00:05');
+
+        $report = new MailSyncReport(
+            createdCount: 3,
+            updatedCount: 1,
+            deletedCount: 0,
+            foldersScanned: 2,
+            errors: [],
+            durationSeconds: 5.0,
+            startedAt: $start,
+            finishedAt: $finish,
+        );
+
+        self::assertSame(3, $report->createdCount);
+        self::assertSame(1, $report->updatedCount);
+        self::assertSame(0, $report->deletedCount);
+        self::assertSame(2, $report->foldersScanned);
+        self::assertSame([], $report->errors);
+        self::assertSame(5.0, $report->durationSeconds);
+        self::assertSame($start, $report->startedAt);
+        self::assertSame($finish, $report->finishedAt);
+    }
+
+    public function testWithErrors(): void
+    {
+        $report = new MailSyncReport(
+            createdCount: 0,
+            updatedCount: 0,
+            deletedCount: 0,
+            foldersScanned: 1,
+            errors: ['IMAP connection timeout'],
+            durationSeconds: 0.5,
+            startedAt: new DateTimeImmutable(),
+            finishedAt: new DateTimeImmutable(),
+        );
+
+        self::assertCount(1, $report->errors);
+        self::assertSame('IMAP connection timeout', $report->errors[0]);
+    }
+}