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xdg-email config

 the xdg-email man says:

   command line tool for sending mail using the user's preferred e-mail composer

the problem is that it uses thunderbird, but I can't find where it comes from,
and how to define this "preferred e-mail"
The only link I found for that was obsolete (--> not found)

Can anybody tell me how?

best regards,
Pierre Frenkiel