[Dovecot] Invalid cross-device link while trying to delete folder - Dovecot 2.0.7

[Timo Sirainen]

On Mon, 2011-06-20 at 15:37 +0200, Laurent CARON wrote:

> When trying to trash some folder from the second namespace, I get the
> following error in the logs:
> 
> 
> imap(USER): Error: rename(/data/mail2/USER/Maildir/.Archives.20112,
> /home/USER/Maildir/.Trash.20112) failed: Invalid cross-device link

It's Thunderbird that's trying to rename the mailbox to under Trash
instead of actually deleting it. And since Dovecot's only choice to
actually handle that would be to copy all the mails between the
storages, it instead simply fails.