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One thing to beware of is, as hinted at by other replies to this thread, apparently "mis-addressed" email could be address-probe spam, designed to get you to reply "sorry, wrong address" and thereby confirm to the spammer that your address is an active one. This is increasingly used nowadays, as many people are no longer so naïve as to reply to "unsubscribe" requests for mailings to which they didn't subscribe in the first place.
If the email is spam (and an address-probe spam is carefully constructed not to look like spam), the headers are mostly meaningless; if you received an email then your address is in the SMTP Envelope, regardless of what the headers say.
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