one person
Yep, there is one person in my organization that does that. She thinks she is much more important than she really is too. I usually only give her the satisfaction of getting a read receipt if it is an email that I am not going to answer right away or is actually important. Thankfully, most of the emails from her are just wanting acknowledgement that I received a certain email so I usually deny the read receipt and say "Yes I got that email".