This is true with DKIM today which uses a label.

On 7/9/19 10:05 AM, Jim Reid wrote:
>
>> On 9 Jul 2019, at 15:50, John Bambenek 
>> <jcb=40bambenekconsulting....@dmarc.ietf.org> wrote:
>>
>> I'm not married to any name, I chose WHOIS for historical reasons. We can 
>> call it _hamsandwich if it builds consensus.
> The concern here isn't what the label is called. Prepending a label won't 
> work with absurdly long domain names because the maximum length of a domain 
> name will be exceeded. That gives bad actors another way of not complying. 
> Not that they would ever provide accurate contact data anyway.
>  
>

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