Sometimes when you try to delete a message from Horde webmail, it fails with this error:
There was an error deleting messages from the folder “Inbox”. This is what the server said: [TRYCREATE] Mailbox does not exist.
A very likely reason is that you enabled the option –> When deleting messages, move them to your Trash folder instead of marking them as deleted in your Horde IMP preferences under Options -> Deleting and Moving Messages. So to solve the problem, you need to check and ensure that the ‘Trash’ folder was created and is selected under the Trash folder option.
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