I received a book that was wrapped in newspaper & the black ink from the newspaper rubbed off on the edges of the white paged book making it look like it could possibly be stained. Will I be able to repost it when I'm done? Also how should I go about letting the sender know that newspaper may not be the best inner wrapping?

Try using a white eraser and gently erasing the ink smudges.

Newsprint is never the thing to wrap books in.  Just tell the sender that it has stained the pages.  You might try some very fine grit sand paper to try to get the surface stain off.  You don't have much to lose by it.  And the newsprint will come off on your hands as you read the book making it likely that it will get more onto the pages of text.   I personally would think this is a RWAP - but YMMV

Ruth

I've also had good luck with sandpaper. Try it out first on an unpostable book.

A 'Magic' erasure works sometimes, but I usually usa a nail buffer. It's a white, four sidded buffer you can get at walmart for a buck and it lasts a long time. Just use it gently.