That hero named Akismet spam guard

Who does not know this plugin, even this is also used (installed) in wordpress.com, akismet is spam guard made by blogger named Matt Mullenweg (wordpress creator) and friends, this very extraordinary guardian in the WP comment spam, but I know that there are criteria that are considered spam by akismet ? As long as I know the spam criteria are;
1.Your comment too short, perhaps less than 5 words.
2.Your comment not know the writing, or there are at least 1 keyword with the same posting.
3.There are a link that included to comment.
4.If you're judged as a blocked visitor by the admin with the identification of the email, use another email.
5.IP you in the black list admin blog, but it's not a problem for users cafe.

So you must be careful when give a comment in Wordpress.
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