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Empty all messages from inbox

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Comcast sent all messages (2,000) to inbox. I want to delete all of them without going message by message, or the "shift method". I want to push "delete all messages in selected mailbox.

Comcast sent all messages (2,000) to inbox. I want to delete all of them without going message by message, or the "shift method". I want to push "delete all messages in selected mailbox.

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You have to select messages in Thunderbird before you can do anything with them including delete. You can select one message and then do control+a to select all. Then hit a delete key.