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What does [Disarmed] indicate on incoming mail

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After installing Thunderbird 45.0. some emails are being marked [Disarmed]. What is that supposed to indicate? Subject Disarmed can't be found in search of Thunderbird help contents.

After installing Thunderbird 45.0. some emails are being marked [Disarmed]. What is that supposed to indicate? Subject Disarmed can't be found in search of Thunderbird help contents.

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Thunderbird does not mark anything Disarmed. Where are you seeing this?