message.php

См. документацию.

<?php
 
namespace Bitrix\Mail\Storage;
 
use Bitrix\Mail\IMessageStorage;
use Bitrix\Mail\MailMessageTable;

class Message implements IMessageStorage
{
    public function getMessage(int $id): \Bitrix\Mail\Item\Message
    {
        $messageData = MailMessageTable::getById($id)->fetch();
        return \Bitrix\Mail\Item\Message::fromArray($messageData);
    }
}