The Klez worm also does that - it will send email using an address from the infected person's address book to another address it found in the address book. I sometimes see bounced mail sent by someone else with the Klez worm - since I use Eudora on a Mac, it's merely an annoyance.
I think XNS would be a much better choice, since it isn't controlled by one company like Microsoft.
With XNS, you have full control over what information you provide.
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The Klez worm also does that - it will send email using an address from the infected person's address book to another address it found in the address book. I sometimes see bounced mail sent by someone else with the Klez worm - since I use Eudora on a Mac, it's merely an annoyance.
I think XNS would be a much better choice, since it isn't controlled by one company like Microsoft. With XNS, you have full control over what information you provide.