Drupal is a popular blog format among the SEO community as it is usually very forgiving with regard to adding link-heavy comments. However, if you regularly comment with Drupal, you will have been frustrated with this message numerous times: "Your submission has triggered the installed spam filter and will not be accepted" Wrong - it will be accepted. You might have to change your submission, though. The drupal spam filter is a bayesian filter, meaning it looks for signals and attemps to calculate a probability for a comment being spam. It's able to learn, but only on a single site basis. It is not anywhere near as advanced as akismet. If you get the message, try these tactics: 1. Change your link and anchor to something less commercial-sounding. 2. Increase the length of your comment. The filter will be triggered if 20% or more of the text is html code. 3. Change the location of your link by putting it in the middle of a big sentence. After trying all these things, I have been able to get through the filter most of the time. The spam filter does not take IP information and blacklist you, so there is no need to switch IP or use a proxy. I hope this was helpful to at least a few of you.