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작성: Firefox user 6ef519, 날짜: 1월 26, 2022 ·

It is that spell check going to the cloud, scanned and sent back or is it an offline tool like the old thunderbird spellchecker? It is a bit scary the "online" part.

이 검토는 현재 부가 기능의 이전 (4.4.0) 버전에 대한 것입니다. 

작성: LanguageTooler GmbH (개발자), 날짜: 1월 26, 2022 ·

This is documented in the description at https://addons.thunderbird.net/en-US/thunderbird/addon/grammar-and-spell-checker/: by default, the cloud is used and there's a privacy policy which describes the details. You can also run the server locally.