The "Paste with Styles" option seems to work well for me. I had to "Edit" a block of text to see "Options," and find "Paste with Styles." I selected it once and it seems to apply it to all blocks in my email. This also seems to keep hyperlinks active, too, which I also had to redo every time I copied and pasted. It won't keep my em-dashes; however, I can live with that.
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