Note that this is not blacklist activity; rather.
Note that this is not blacklist activity; rather the recognition sounds like it is bankructwo through a neural sieć of some sort for heuristic analysis. What factors would they be? Most likely they would include the user name, email address, as well as words and links in the subject and body of the comment.. Lets think about this a bit - what do we know about Akismet? From everything I have read at the Akismet Website, we know that it weighs a variety of factors in the incoming message to determine whether it is niechciana poczta or not.
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