[Dovecot] default_mail_env %d problem

Hi all. I`ve got such problem: default_mail_env = mbox:%h/mail/:INBOX=/var/mail/domain.net.ua/%n - it works. But when I say: default_mail_env = mbox:%h/mail/:INBOX=/var/mail/%d/%n - it not. Log: Aug 3 22:51:19 serv dovecot: POP3(user): mbox: data=/home/user/mail/:INBOX=/var/mail//user Aug 3 22:51:19 serv dovecot: POP3(user): mbox: root=/home/user/mail, index=/home/user/mail, inbox=/var/mail//user Aug 3 22:51:19 serv dovecot: pop3-login: Login: user=<user>, method=PLAIN, rip=xx.xx.xx.x, lip=xxx.xxx.xxx.xxx Aug 3 22:51:19 serv dovecot: POP3(user): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0