The optimum is rejecting unsolicited mails during the SMTP dialog, this way there will be no bounces to innocent bystanders (as caused by the latest epidemic disease).
Not really. If the message goes through intermediate mx hosts a bounce will be sent to the spoofed sender. The only way to handle these virus messages is to drop them on the floor, but there are other reasons not to do that. I don't know that there's a good solution.
Mike Stone
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