On 02/18/2016 09:49 AM, György Kövesdi wrote:
>       An error occurred while sending mail. The mail server responded:
>       Mailbox unavailable <user@myserver>.

Sounds like a delivery failed to that mailbox.  Check your logs for 
messages that were accepted and then failed to deliver to the maildir.  
Figure out what caused the failure and prevent it from happening again.  
When the message is delivered, the mailbox should be available again.

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