//If inString contains @yahoo., we consider this to be an email address suffix such as @yahoo.com or @yahoo.it, and delete it and everything after it. Thus, jdoe@yahoo.com becomes simply jdoe.
//However, we must leave other suffixes, such as sbcglobal.net, alone. We can't simply match @, or we would delete the @sbcglobal.net suffix and leave the user unable to connect with it.
//Future expansion: Only delete if “@yahoo.” is followed by a known TLD and (if appropriate) 2LD, in order to support oddball suffixes such as “@yahoo.example.com”. I don't know whether any such suffixes exist. —boredzo