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Hm, interesting idea, except I'm trying to erode the polygon, which should result in a smaller polygon. In your example, your green polygon has dilated into a larger blue shape. I am not sure that you can use RegionDilation to result in a smaller shape.
This returns EmptyRegion[1], the empty subset of R^1. This is surprising because our shapes are 2-dimensional, not 1, so I'd expect EmptyRegion[2] here. I see that RegionEmbeddingDimension returns 2 for the Polygon and the Line you suggested.
Just a note that when I adapted this solution to my image-cropping problem, I encountered a "bug" where TrackingFunction doesn't work with multiple Locators, as described here.
This helps, thank you! One last question: how would you tweak your example to use indexed variables like a[[1]] and a[[2]], instead of a and b, so that I could work with a list?
@flinty, thanks for digging in to that RFC, I didn't know the difference between multipart/alternative and multipart/mixed. Interestingly, Wolfram Tech Support emails have multipart/alternative MIME types, yet their text/plain and text/html parts are very different. (I filed a support ticket with WRI about that.)
@LouisB, thanks for pointing that out. Even adding Infinity to Cases, it still only finds the text/html portion only in the Plaintext field, where I would have to parse it out from the rest of the whole email. I was hoping MMA would offer something like ImportString[email, {"EML", {"Multiparts",2} } ] to parse it out for me.
