[Dovecot] problem with default_mail_env

[Roi Efrati]

I'v set the default_mail_env to maildir:/var/maildir/%d/%u where
/var/maildir/ is the root dorectory for my maildir tree and I'm
getting the folowing error in the maillog :
Jan  3 15:16:58 websrv pop3(roi): unlink(/var/maildir//roi/cur/new:2,T) failed:
Is a directory
Notice that the %d is missing.
If I change to  'default_mail_env =
maildir:/var/maildir/example.tld/%u' then it's all working fine only I
can't create other virtual domains.

If anybody can help me solve this one...