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From: Steinar Bang <sb@dod.no>
Subject: Possible to make gnus handle mailto URLs with cc, subject and body?
Date: Sat, 06 Jun 2020 17:32:12 +0200
Organization: Probably a good idea
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Is there a way to make gnus handle mailto URLs with cc, subject and
body, when those URLs are clicked in a browser?

Here's an example URL:
 mailto:korr@somewhere.com?cc=some.one@somewhere.com&subject=Hittat%20fel%20i%3A%20%22Nytt%20ras%20i%20Nordnorge%20%E2%80%93%20orsakade%20stort%20h%C3%A5l%20%22&body=Jag%20har%20hittat%20fel%20i%20artikeln%20%22Nytt%20ras%20i%20Nordnorge%20%E2%80%93%20orsakade%20stort%20h%C3%A5l%20%22%0A(https%3A%2F%2Fwww.svt.se%2Fnyheter%2Futrikes%2Fnytt-ras-i-nordnorge-orsakade-stort-hal)%0A%0AKommentar%3A

I have no idea what's sent on from the browser, beyond the email addres.
And I have no idea how it's sent on different platforms.

What I would like to happen is Gnus preparing a message with to, cc,
subject and body, decoding the arguments for subject and body.