I listed a book that I when I listed it, I didn't notice..this..

The book is hardcover.  When you go to the back cover and open it the back page goes with the cover, and the book is separating a bit here.  I'm not sure if separating is the right word, but not sure how to describe it.  Is this still mailable?  I have some one wanting the book now and I'm not sure.  I mean, the books I have gotten are not in perfect shape at all.  For the most part, this book looks brand new.  So, not sure what to do.. Ideas?

I'm thinking maybe the book falls into this catagory?  But the book is intact.  So, not sure.  Does anyone understand what I'm saying for my book condition?

Binding:

• Must be intact, with no separation on the inside or outside of the book
• If the book tends to open at a particular page, this is OKAY
• Small amount of fraying or denting at top or bottom is OKAY

If there is separation of the cover from the book, then no it is not postable. Is it possible for you to post a pic of the book?