man touch man chmod man chown
file has ready, chmod use 755 and chown use vmail, this below :
[root@mail ~]# ls -la /etc/dovecot* -rwxr-xr-x 1 vmail vmail 42989 Jun 11 17:08 /etc/dovecot.conf -rwxr-xr-x 1 vmail vmail 181 Jun 11 15:27 /etc/dovecot-sql.conf [root@mail ~]#
[root@mail ~]# ls -la /var/log/dovecot.log -rwxr-xr-x 1 vmail vmail 1180 Jun 11 16:42 /var/log/dovecot.log [root@mail ~]#
there is something wrong on my configuration