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"Spoofing return addresses should be illegal; in fact I believe it is now. The first internet provider that figures out a way not to forward email wih false return addresses will win a lot of new customers. Most of the false address used in spam are completely bogus and lead nowhere.

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Spoofing used in spam is illegal. Creating and spreading viruses is illegal, too. The problem I'm addressing is the one where a virus takes names out of the infected person's address book and spoofs them into the sender field before sending the virus out.

I've even gotten viruses with my email address in both the From: and To: fields, typical of this nonsense. I have no viruses on my computer and never will.

I'm glad to hear you never will. I've cleaned up lots of computers, but never seen a virus on a computer where ordinary precautions were taken. Nearly all the recent worms would have been stopped it people simply installed security updates within a month of their release.