Undo GMail

設定で言語を英語(US or UK)にして、設定して、その後再び「日本語」に戻せば日本語環境でも使えるはず。

Official Gmail Blog: New in Labs: Undo Send
And now you can do just that. Turn on Undo Send in Gmail Labs under Settings, and you’ll see a new “Undo” link on every sent mail confirmation. Click “Undo,” and we’ll grab the message before it’s sent and take you right back to compose.

タグ：Gmail Google UNDO グーグル メール Mail やり直し