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I've never sent books from Calibre to Kindle, but in my version of Calibre, under Preferences, then "Sharing books by email," the first icon on the right says "use GMX."
Once you've got Calibre set up the way you want it again, I would seriously consider Exporting all Calibre data to a thumb drive (it's in the drop down under the Library icon). I've used that and moved Calibre data from my Linux to a Windows computer and it kept all plugins, books and settings.
BTW, there are also Calibre forums here, where you get excellent and fast help for Calibre issues.
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