Comment 9 for bug 592871

Upstream feedback:

I understand where they are coming from, but EICAR does not work for
these test cases. The viruses are deactivated. Pymilter is not a
traditional antivirus that looks for signatures. It simply bans
executable content. Many viruses attempt to disguise their
executability, taking advantage of how malformed emails are handled.
That's what the test cases are about.