Message: 8 Date: Tue, 12 Mar 2013 19:32:01 -0400 (EDT) From: Mouse < mouse at Rodents-Montreal.ORG > In that specific case, I can't say. But see below. <snip> In this case, the most plausible explanation that comes to mind is that the response you saw was sent out to both you and the list, and that mail fromk the list to you is delayed - perhaps you're late on the list, perhaps there's something about the mail path between the list and you, I don't know. Thus, Enrico sends to the list. Allison gets a copy quickly. Allison replies to you and the list. You get the off-list copy. Then you get the list copy of Enrico's mail. Later, you get the list copy of Allison's mail; perhaps you ignore it, perhaps your software notices it's a duplicate and silently hides it from you, I don't know.