Mailspring-Adapta-Theme
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Adapta Dark Theme For Mailspring
Mailspring Adapta Theme
Adapta Dark theme for mail client Mailspring

Install
Download ZIP-Archive and extract. Run Mailspring, select Edit - Install Theme... and choose folder.
For KDE
sed -i 's|2F343F|383C4A|g' ~/.config/Mailspring/packages/adapta/styles/ui-variables.less