After they entered, they may have left all the other windows and doors open Before working in cyber-security, I once worked at a company, when I was approached to look at another staff member’s email account which was “acting a bit funny”. When I looked, I found the sent mailbox was filling every 5 seconds with a new sent email, each to a seemingly random recipient, each purporting to be able to help the recipients “Meet girls” or “enlarge” one’s whatnot.