Block URL from being linked to/used to post pictures.
 

It seems that vrcc.photostash.com is having security issues. When users post pictures linked from that site, MS Security is flagging that thread as a security risk. Users get a big red box telling them that my forum is the source of the malware. This gives the appearance that my forum is passing on Trojans and malware. How can I block users from linking to that site? If I can't block them from creating the link, is there a way to "break" the link so it doesn't work?

I don't want my forum ending up on a list of "bad" sites. How can I prevent this?

I hope I was clear. I have attempted to add the url to censored word list and rebuilt the post cache but it didn't "break" the links, they still worked.

Thanks for any insight you might have.

Dave