When sending mail from within horde, the following error message may appear:

The folder "Sent" was not created. This is what the server said: Client tried to access nonexistent namespace. (Mailbox name should probably be prefixed with: INBOX.)

To resolve this, choose Options from the top menu bar, and then Personal Information. At the bottom of the subsequent screen, tick the box next to "Save sent mail?" if it is not already enabled, then choose Sent from the "Sent mail folder:" dropdown box below it. Choose Save Options, and horde will now save sent mail to the defined folder. Alternately, to not have horde save sent mail in order to save space used by email, untick the "Save sent mail?" box, and choose Save Options. 
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