Today I got a technical support mail from my e-mail provider (GMX):

Does it looks like a real warning? Yes, reading the first two lines of the mail in my OL2003 preview (I'm careful) of the inbox I opened that (bad! But who knows?) and got another warning:

Scan type:  Realtime Protection Scan
Event:  Virus Found!
Virus name: W32.Beagle@mm!zip
File:  Readme.zip
Location:  Mail System

Morality: spamers and worm/virus mass mail senders are real humans. They did not simply take over random e-mail addresses to spoof the sender address, they impersonate it! Fortunately nothing badly happens to my system :-/

You are carefully enough?