>We have had incidents of our postmaster account being the spoofed address 
>that is used.
>
>Does anyone have any ideas how Klez is doing this?

Klez sometimes makes up addresses, by combining a known username with a 
known hosthame.  So if you have "[EMAIL PROTECTED]" and 
"[EMAIL PROTECTED]" in your address book, it could send to 
"[EMAIL PROTECTED]".

It also gets addresses from the web cache, so if someone was recently at a 
page with "[EMAIL PROTECTED]", you could see Klez sending E-mail from 
"[EMAIL PROTECTED]".
                                 -Scott

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