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I see a lot of fake words in my spam subjects lately, and so I looked around and found this:

“Cooee is the shortest word with two double letters.”

Which means that any subject containing a word with two double letters is almost certainly misspelled or outright fake, without even resorting to fancy dictionary lookups.

So I have added a series of Mail.app junk filters for any subject from people not already in my recipients list or address book, containing at least two double vowels.

If it had regex matching, it would be much easier, but oh well.  I just found and installed JunkMatcher and it looks quite promising.  We’ll see.