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Okay, just to take it a step further, I tested the example address that the OP provided (snape@hogwarts.sch.uk) both from Apple Mail sent through smtp.fastmail.com and the FastMail web interface (by using a wildcard address and typing it in exactly as shown above). It worked completely fine in both cases, with the "spoofed" message arriving at all of the three destination addresses I tested it with.
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