Unfortunately there doesn’t seem to be a third-party email program with functioning gesture support. Trying to switch to Linux before Windows 10 is deprecated myself, but since my grandma uses a Surface Pro in tablet mode, I opted to just install an older version of the Mail and Calendar program on Windows to remove the redirect-to-outlook component, with Microsoft Store auto-updates disabled.
Unfortunately there doesn’t seem to be a third-party email program with functioning gesture support. Trying to switch to Linux before Windows 10 is deprecated myself, but since my grandma uses a Surface Pro in tablet mode, I opted to just install an older version of the Mail and Calendar program on Windows to remove the redirect-to-outlook component, with Microsoft Store auto-updates disabled.