Horde - Sent Folder. Client tried to access nonexistent namespace.

Sometimes when the Horde webmail application is updated, the Sent folder stops working for some people. You may get an error  message when trying to send mail as follows...

"Client tried to access nonexistent namespace"

To fix this, simply follow these steps...

1. From the left menu, go to Options -> Mail -> Personal Information
2. Scroll down to the bottom of the page. Tick the box to save sent mail.
3. Choose the "Sent" folder from the drop down list.
4. Click the "Save Options" button.

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