diff --git a/src/Mail/Dto/MailAttachmentDto.php b/src/Mail/Dto/MailAttachmentDto.php
new file mode 100644
index 0000000..cb6362a
--- /dev/null
+++ b/src/Mail/Dto/MailAttachmentDto.php
@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mail\Dto;
+
+final readonly class MailAttachmentDto
+{
+    public function __construct(
+        public string $partNumber,
+        public string $filename,
+        public string $mimeType,
+        public int $size,
+    ) {}
+}
diff --git a/src/Mail/Dto/MailFolderDto.php b/src/Mail/Dto/MailFolderDto.php
new file mode 100644
index 0000000..d6ff8ff
--- /dev/null
+++ b/src/Mail/Dto/MailFolderDto.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mail\Dto;
+
+final readonly class MailFolderDto
+{
+    public function __construct(
+        public string $path,
+        public string $displayName,
+        public ?string $parentPath,
+        public int $unreadCount,
+        public int $totalCount,
+    ) {}
+}
diff --git a/src/Mail/Dto/MailMessageDetailDto.php b/src/Mail/Dto/MailMessageDetailDto.php
new file mode 100644
index 0000000..76462e7
--- /dev/null
+++ b/src/Mail/Dto/MailMessageDetailDto.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mail\Dto;
+
+final readonly class MailMessageDetailDto
+{
+    /**
+     * @param list<MailAttachmentDto> $attachments
+     */
+    public function __construct(
+        public MailMessageHeaderDto $header,
+        public ?string $bodyHtml,
+        public ?string $bodyText,
+        public array $attachments,
+    ) {}
+}
diff --git a/src/Mail/Dto/MailMessageHeaderDto.php b/src/Mail/Dto/MailMessageHeaderDto.php
new file mode 100644
index 0000000..fe9d022
--- /dev/null
+++ b/src/Mail/Dto/MailMessageHeaderDto.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mail\Dto;
+
+use DateTimeImmutable;
+
+final readonly class MailMessageHeaderDto
+{
+    public function __construct(
+        public int $uid,
+        public string $messageId,
+        public ?string $subject,
+        public string $fromAddress,
+        public ?string $fromName,
+        public array $toAddresses,
+        public ?array $ccAddresses,
+        public DateTimeImmutable $sentAt,
+        public bool $isRead,
+        public bool $isFlagged,
+        public bool $hasAttachments,
+        public ?string $snippet,
+    ) {}
+}