I am trying to recreate a outlook/exchange mailbox in our application and I am in the early stages building the models. However, I am coming across something that is making me question if a model can be dynamic enough to contain itself. The issues comes up for the folder class which can contain emails or more folders:

    public class Mailbox
{
    public List<Folder> Folders {get; set;} = new List<Folder>();
}
public class Folder
{
    public List<Folder> Folders {get; set;} = new List<Folder>();
    public List<Email> Emails {get; set;} = new List<Email>();
}
public class Email
{
    public string Id {get; set;}
    public Contact From { get; set; }
    public List<Contact>? To { get; set; } = new List<Contact>();
    public List<Contact>? Cc { get; set; } = new List<Contact>();
    public List<Contact>? Bcc { get; set; }
    public string Subject { get; set; } = "";
    public string Body { get; set; } = "";
    public List<FileAttachment>? FileAttachments { get; set; } = new List<FileAttachment>();
    public DateTime ReceivedDate {get; set;}
}

public class Contact
{
    [EmailAddress]
    public required string EmailAddress { get; set; }
    
    public string? FirstName {get; set;}
    public string? LastName {get; set;}

}

public class FileAttachment
{
    public string Id {get; set;}
    public MemoryStream File {get; set;}
    public string FileName { get; set; }
    public string ContentType { get; set; }
    public byte[] ContentBytes { get; set; }
}

Is this allowable? What issues will I run into because its not tripping any errors and compiles but something doesn’t seem correct about this.