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Unsent Messages - there are no messages to send.

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I keep getting an UNSENT MESSAGES box to check either box: SEND NOW or SEND LATER - every time I start the Thunderbird program and I have no messages to send. How do I get rid of this problem ?

I keep getting an UNSENT MESSAGES box to check either box: SEND NOW or SEND LATER - every time I start the Thunderbird program and I have no messages to send. How do I get rid of this problem ?

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Go to the Outbox and check what is there.