NIP-05 don't exist in relays afaik. Clients query the URL and verify if your pubkey exists in that URL service server
part of nip5 is in kind0 on relays
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But still clients individually query servers directly or they check relays and relays do the checking themselves?
nostrs general model is clients check things and in this case i think that holds but relays can and do check some things, the nostr software ecosystem is very diverse