No, it doesn't require a penis to receive. Have you never been shown advertisements for things you have absolutely no interest in because the algorithm misidentifies you? These kinds of emails are sent out by the millions (billions in a universe like TiTS). I'd expect a spammer to care about a target's gender identity only insofar as it makes the target more likely to fall for the scam but given 'SPECIES DETECTION ERROR' it seems the automation's ability to accurately customize the message for the target is limited.