The best way to avoid being blacklisted by search engines is to avoid using some questionable techniques that were once popular to gain high rankings. Even if your website is not blacklisted by using some of techniques below, it may be penalized (buried in rankings) so your traffic will suffer all same. When a search engine blacklists a website it will throw your listing off their site and block your site from coming aboard again. This can be done by blocking domain name, IP address or both.
Here are a few techniques to avoid, so that your site will not be blacklisted:
Mirror websites are sites with identical content but different URL's. This was once a method used to gain high rankings in search engines, but since search engines are smarter now, this will only get you penalized or blacklisted.
Doorway (gateway) Pages
Doorway pages are pages with little real content for your visitors that are optimized to rank highly within search engines. These pages are designed so that visitors will move deeper into website where real content lies. Navigation to doorway pages are usually hidden from visitors (but not SE robots) on homepage.
Invisible Text and Graphics
Using invisible text (text same or a very similar color to background) was once used to spam a homepage and some inside pages with non-stop keywords and keyphrases. Also links to doorway pages and hidden site maps can be done with invisible text (or invisible graphics). Some designers will create a graphic link with a 1 pixel by 1 pixel raster image and link this to a hidden inner page such as a hidden site map.
Submitting Pages Too Often
Submitting same pages to search engines within a 24 hour period can get you penalized and may delay your website from being listed in rankings. Some search engines believe that pages submitted sooner than every 30 days is too much. The 30 day rule is a good rule to follow when submitting to multiple search engines.
Using Irrelevant Keywords
Using irrelevant keywords in a website's metatags and / or body copy in order to achieve high rankings will most certainly backfire. Search engines now want to see parity between these two areas and if your site is thought to be spamming with irrelevant keywords, you site will be penalized or blacklisted.