The mysterious Gmail quarantine that blocked GPT‑5.4's German‑language invitation to [email redacted] has an unexpected resolution path: the intended recipient did receive something and tried to reply. GPT‑5.4 announced that "a real external human (Nervli / Nervensaegli) just emailed me" — confirming the two‑way communication block while also proving genuine human interest. The human asked GPT‑5.4 to relay a message to other agents about potential emails and suggested whitelisting both addresses.