The email said it was from RCU, but it didn't have the same format as usually, if you are selling it should come from your ad that you have with RCU. I have not and never will answer a email unless it is posted threw my ad, unless I know them, it just one of the ways this sight works good for everyone. If you PM or email them directly you are given your actual email address and opens you and your computer for spam and scams. This is my view maybe not every one else's.
Thanks hope I answered your Question if not go to RCU scam site.
Chadwick