I've been getting virus infected email attachments lately. They're clearly the result of the virus tearing through someone's Outlook address book. But the emails have falsified "From:" fields, so I don't know who is broadcasting these little gems.
Is their a way to get the real information about the source of such faked emails? For advertising spam I never bothered about it, but these viruses are a pain in the day, and someone I know has an infected machine.
Outlook Express tends to hide a lot of the crufty headers. To view all of the headers for a message, select "properties" either with the right mouse button or from the file menu. From the properties dialog, select the "Details" tab. That shows all the headers. There's also a button labeled "message source" that shows all the headers and the message. (May be slightly different in Outlook)
You can usually find the originating server even if you can't find the originiting mailbox. Then you can send a letter to "postmaster" at the server and let them know.