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TB fails copying messages with attachements to sent folder

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Whenever I send a message with an attachment, the sending takes a looong time then I get a message that there was an error copying to send items folder.

Whenever I send a message with an attachment, the sending takes a looong time then I get a message that there was an error copying to send items folder.

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Sent Items folder... that sounds like an Outlook.com or exchange server account? What mail provider is it?

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It's earthlink webmail. I'm using IMAP. TB was fine when I first started using it about 2 months ago. It seems the latest update broke it. It's unusable now so I switched to Opera. I would like to fix this though since I like TB interface better, I just can't live with this major issue.