Linux

Look for processes running on your Linux box that you do not realize. Also, you could do a port scan against the Linux machine, to see if an IRC port is open on it. Many of the major port scanners (like my favorite, NMAP) will identify the most common usage of an open port. But something like IRC could run on any port, so it is not foolproof. But a port scan will tell you what ports are open, and you can then decide IF the ports you see open should be open!

Something else to keep in mind, after you analyze your server, is that this could just be a hoax e-mail. Don't assume that yet, but don't also forget this point.

hope this helps

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