Just had this one happen to me, so I don't know if it's been around a while or not.
Got a question from an eBay member asking about a part I have listed. I have my mail forwarded to my business e-mail, so this is what I saw. The page looked normal at first glance, but I felt something was wrong. It had the normal "Respond to this Question in My Messages" button on the right. I pressed the "Respond Now" button and was one letter short of signing in when something in the back of my head said to stop. I checked the guys feedback and saw the number shown on his e-mail and the one on the eBay site were off by 11 feedbacks. I then compared this e-mail to other e-mails from eBay members which were real and noticed the auction details where missing from the bottom. I went to my eBay mail box and there was no sign of the e-mail. This is scary and I almost fell for it.
Just letting others know if they have eBay questions forwarded to another mail box to always check and answer eBay questions on the eBay site.