And another interesting resource that I had never come across, so I'm sharing it with you. It is the wiki of the Anti-Spam Research Group (ASRG). THE ASRG no longer exists since 2013but on the other hand its wiki continues to live, in particular via the contributions of John Levine.
After a little exploration, the part that seems to me the most interesting is the referencing of a very large number of techniques used to fight spam, with information like the date of first use of the technique, if it is widely used, if it is effective, ...
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Here is the link to the index of this section of the wiki: https://wiki.asrg.sp.am/wiki/Taxonomy_of_anti-spam_techniques
(Feel free to reread the article that Badsender published on different types of spam filters)
