You know the URL wrapping problem? One workaround for Outlook users (or those sending to them) has long been to enclose the URL in angle brackets. I suspect because of this some other MUAs now do the same thing. It's not an ideal solution, but it works a lot better than the browser "unwrap the URL" tools I've seen, partly because it means clicking the URL still works and partly because the MUA doesn't add the "=20" decorations.