How disable autocorrect/spell check in Windows 10 Mail app?

[peter__________]

Hello,I'm happy with Windows 10 Mail app, although I can't find how I can disable spell check in Mail. I prefer having all Windows programs in English, but I write most of my E-mails in Dutch. While typing in Dutch, I get a lot of very annoying autocorrections.Under 'options' in Mail I can find how to 'not show' the red underlining, but autocorrect is still on somehow. In Windows 10 settings, the autocorrect is switched off, so I assume Mail has its own spell check/autocorrect. Does anyone know how to switch it off??

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