[Dovecot] mkdir imap with user at domain.com

[wiki kaha]

I have a bit a problem.
In a virtual domain enviroment i use
for login "user at domain.com" and the password.

in the mysql authentication it works beautiful
with %d and %u placeholder.

Now when is whould like ad a folder via imap
i get an error 

imap(user at domain.com):
mkdir(/var/mail/domain.com/user at domain.com/.test)
failed: No such file or directory

It should be 
mkdir(/var/mail/domain.com/user/.test)

Is there a way to configure this?

Thanks
Regards
Karl-Heinz


		
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