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Something about your description is confusing me. You say that the message was in your Gmail spam folder, so I assume that the message was delivered to your Gmail address. How does Fastmail enter into this? Was the message backscatter (messages sent by a spammer to a non-existing email address which bounces back to you, since they used your From address)?
If you created a Fastmail alias, did the message in your Gmail spam folder have that new alias as the From or the To address in the full headers?
Bill
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