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Re:TrendMicro Node.js HTTP server listening on localhost can... by JoshTriplett on Monday January 11, 2016 @08:09PM (#10884879)
While email can't directly call JavaScript, these URLs look like they'd work if just loaded, so an <img> tag might suffice to cause shell execution.
Re:TrendMicro Node.js HTTP server listening on localhost can... by raverbashing on Tuesday January 12, 2016 @04:51AM (#10886432)
True, and you can always have a "Click here for more info" in the email pointing to a believable page.

But yeah, an image will most likely do it.