it seems moderately likely that this is misbehaving antispam (e.g. what happened to @allgebrah).
also likely that they hide...
now I can't cite any case studies but from my own antispam experience and from watching gmail and other large providers
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I very much doubt spamassassin would help them
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I run nothing except spamassassin in a default config and I leave my email everywhere. I get lots of spam... all filtered
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