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how can I turn on ask about "Do you want delete this mail?" now when I press button Delete, mail is delete without ask me

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how can I turn on ask about "Do you want delete this mail?" now when I press button Delete, mail is delete without ask me

how can I turn on ask about "Do you want delete this mail?" now when I press button Delete, mail is delete without ask me

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I change the value to false and nothing change. When I delete mail, thunderbird dont ask me about my decision.

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