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Thunderbirdの署名に挿入されるハイフン ( -- ) の消し方

More than 3 years have passed since last update.

「ツール」→「オプション」
「詳細」→「設定エディタ」

検索フォームに
mail.identity.default.suppress_signature_separator
と入力

初期値「false」を「true」に変更

以上

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