This is the SoBig virus guys in case you already don't know. It spoofs addresses on the infected computers and sends out junk to overload the Internet.
There is no personal attack. It is just that some computers that are not protected have been used as middle men to broadcast these e-mails to lists of addresses that reside on them. In most cases, the users don't even realize what is going on with their machines. It comes mostly from users that either don't have av on their machines or don't keep their pattern files up to date.
You can read about the viruses and worms we have been contending with over the last few days here:
http://www.trendmicro.com/vinfo/Keep your av pattern files up to date and use a good firewall. If you are one of these guys I have heard about who doesn't have av installed because "it slows my connection down" or "I don't have time" or "I can't afford it" then you are probably the person who is enabling these virus cretins to do their business. No virus distributor is going to be the one to mount the attack. All they do is scan for ports on on-line machines, when they find an open one they go in and plant their bugs. If the bug is discovered by an av program it is gone. If not, it does its work when it is scheduled to or when it is contacted to do so by the main distributor.
If you keep your av pattern files up to date and use real time scan when you are on line, you will not have any trouble.
If you "run bare" you are either going to get infected, you are now infected, or you are going to infect someone else.
Imagine...
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