I received a "Suspicious sign in prevented" email this morning for one of my Gmail accounts. I changed my password just in case but upon inspecting the email details it looks odd.
It was accessed by
18.104.22.168 which seems to be owned by Google (mail-ie0-f131.google.com). When opening up account activity I get 'Unknown' under access type. So it hasn't even logged whether it was accessed by a browser or by POP.
This all seems very strange. Should I be worried?