posted on Jun, 23 2004 @ 06:45 AM
I get those "mail undelivered" messages a lot, yesturday on my hotmail address I recieved 44 of them in one day!
I am not too sure what they are, but they always tend to come with attachments, which hotmail says contained viruses, so yea - I guess their spoofers
trying to copy the messages, in hope you open the attachment. (as it looks like it comes from a 'reliable' source - postmaster).