I don't think the Verisign SMTP server would suffer. Since it rejects incoming messages before the message body and attachments are sent. Darn it.
Another approach might be to start selling CD's with 30 million email addresses for spaming that have nothing but bad domain names.
Of course, all this would be wrong anyway. We don't really want to be following Verisign's bad example and hacking the Internet. ;-)
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