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red axe head suddenly appeared

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My mailbox display suddenly began displaying a red axe head in the second column, for unread messages. What is this, what does it mean, and why did it suddenly appear?

My mailbox display suddenly began displaying a red axe head in the second column, for unread messages. What is this, what does it mean, and why did it suddenly appear?
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What is this, what does it mean, and why did it suddenly appear?

The yellow bar further down in your screenshot should say it all. For more information on junk mail controls see https://support.mozilla.org/kb/thunderbird-and-junk-spam-messages