スパムフィルターと外国のスパム、第5部 – Japanese

Japanese is a complex language.  It’s so complex that I thought I’d dedicate an entire post to do a very brief overview of it.  If you speak Japanese and something I say is incorrect, it’s because I don’t speak the language.  You may correct me if you so choose, and I shall reply "Ah so…

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Spam étranger et les spam filtres, partie 4 – Single byte character sets

In my last post, I spoke about the problem of character encoding.  The ASCII character set works fine in North America (excluding Quebec, Mexico and Miami) but as soon as you leave the continent, you start running into all sorts of weird characters that ASCII doesn’t know about.  So what do we do?  Well, the…

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Spam filters and foreign spam, part 3 – ASCII

If everyone spoke English, and spammers only sent spam from bots, spam filtering would have a relatively simple task (relatively speaking, of course).  But, that simply isn’t reality.  The biggest shift in spamming over the past 18 months or so is the use of reputation hijacking – hiding behind someone else’s good reputation in order…

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Spam filters and foreign spam, part 2 – Collisions

Note: this post contains some explicit language relating to stuff commonly found in spam. One of the very basic ways of fighting spam is with content filtering.  At a basic level, you look in the content of an email searching for words, patterns and phrases that are spammy.  Here’s an example from a message that…

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Spam filters and foreign spam – part 1

One of the ideas for a series that has been floating about in my head for a long time is the idea of fighting spam in foreign languages. Now, while I am fluent in over six million forms of communication, unfortunately, the foreign languages common to our international customer base is not among them.  Thus,…

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