**Describe the change(s)**

A clear and concise description of what you changed and why you changed it.

**Example code to use new / updated methods**

```php
$mailbox = new Mailbox(...
```

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Make sure, that these boxes are checked before creating your pull request:

- [ ] A short description of this change is provided
- [ ] A short example code is provided, if possible
- [ ] PHPUnit tests for your changes exists
