How to delete a corpse Mailbox

[Mark Schwarz]

Hello,

i have a user corpse in my cyrus mailboxes.
How i can delete a user like this?
The Problem is the user doesn't exist as a file.
If i try to delete them trough cyradm the following message says:

localhost> info user/rene.*
{user/rene.DOMAIN.org}:
  partition: default

localhost> dm user/rene.DOMAIN.org
deletemailbox: System I/O error

Thanks

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