關於 Mail Loop

網路上找到的解釋

http://encyclopedia2.thefreedictionary.com/mail+loop

mail loop

A message that is sent to an entire subscriber list rather than the owner of the list. Mail loops usually occur by accident, but can be maliciously deployed as well.

例子

I have looped him.

Thanks for looping me in.

但聽說外國人很少這樣用 ?