Redirecting to other domains
One of the tricks that spammers use is the redirect. When you are trying to go to one website and end up being redirected to a completely irrelevant website, that is usually a spam redirect. Spammers use this 302 redirect or "meta-refresh" so that they can change the website they're redirecting traffic to. Spam websites get shut down constantly, they need to be able to redirect traffic to the new replacement sites all the time.
One way to distinguish yourself from the redirecting spam sites is by using a permanent or 301 http redirect. A permanent redirect tells search engine spiders that this redirect is not going to change and that they should change the URL in their directory to the site traffic is being redirected to.