I’ve released a beta of 4.0.20, build 6560, on the forum: https://forums.getpaint.net/topic/112124-paintnet-4020-beta-build-6560/
There’s plenty more commentary and discussion there, so I’ll just keep this blog post brief instead of repeating it 
5 thoughts on “paint.net 4.0.20 Beta released (with Dark Theme)”
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Can you make in the File menu an option to save the image and send it by email?
That is not something I’m planning to do, sorry.
You could just save the image file then upload it to an email client like GMAIL or Yahoo. I know, it’s slower than just clicking a button, but it’s better than nothing.