Of all companies, you’d think HP would have some sort of control over this type of thing by now.  Although an itchy trigger finger sent HP earnings guidance out early, it was good enough news to pop the stock 3%.  According to the Financial Times, an employee accidentally leaked financial information "through an internal e-mail sent on Monday evening to a single outside party."

Two key takeaways:
1.  This is another example of a non-malicious action leading to an embarrassing corporate moment
2.  There are apparently no controls in place to stop what would have been easily identified by context alone and intercepted for return to the sender for confirmation