We had someone at my last job who started playing the email blame game as soon as she realized she was on thin ice with the company. I started receiving rude emails demanding information and stating that I was putting her off deadline and apparently causing the eventual demise of the organization. These emails made zero sense as I'd already provided the information on multiple occasions, but I'd just resend it and write her off as nuts.
Turned out the CEO was being BCC'd on all of them, but of course not on my replies repeatedly providing the information... very sneaky. I never would have realized what she was doing had the CEO not called my boss to see why I was being so unreasonable. The CEO didn't understand BCC, so she just assumed I would include her in my responses, which backed up my coworker's assertion that I was ignoring her emails.
My next reply was a very polite and helpful message explaining how the search function works in Outlook... CC'd to the CEO... with all previous exchanges pasted below my signature. Two weeks later, the coworker was gone. Whew.