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I just noticed this icon I have never seen before in Thunderbird and I am wondering what it is:

enter image description here

Hovering over it doesn't tell me anything. Can anyone provide any insight?

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Icons in this place show that the message was encrypted and/or digitally signed using S/MIME.

The red cross icon means that there's a problem with the certificate used to sign this message (e.g. it was expired, or otherwise cannot be verified). Click on the envelope to see the details.

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