What do you think about this?

[macker]

Originally Posted by Pornopat

And to answer your question. A site that links to your site could be what they call in seo a "bad neighbourhood". If so it will hurt your link popularity very badly.

I've known sites to be totally dropped from the serps as a result of this. Although I'm not sure what you can do about it if someone is redirecting to you from their domain... ummm.