This one is new to me and also a huge shock to me.
Firstly it has nothing to do with email.
This happened internally on the Ebay web site. I actually clicked on an auction image and it automatically took me to a log in page.
I did not think anything of it, because this will happen when you are trying to access certain things.
I logged in and then it took me to a confirm email page.
That was new to me and I looked at the URL which was off Ebay.
I hit the back button and noticed that sign up page was also off Ebay.
It happened so fast and I usually work fast on Ebay it almost got me.
I hit the live chat button and reported it and within 10 minutes the listing was gone.
Just to be safe I reset my password.
Keep an eye out, they can get you inside Ebay as well.
David