Just like on the envelope of a normal hand-written letter, any sender address can be specified. “CERN.CH” can easily be spoofed so that an e-mail looks like it comes from someone at CERN, but actually doesn’t
If you take advantage of the plethora of software snippets, code excerpts, libraries and the like circulating on the Internet, don’t forget that there’s a risk: is the code safe? Bug-free? Maintained? And free of any malicious components?
Once you are connected to CERN’s wired or wireless networks, you are bound by CERN’s Computing Rules, which requires you to always keep your system up-to-date, fully patched and protected against unauthorised access