I thought I'd have a stab at building this on 2 xen boxes. All was going swimmingly until I came to configure the mx servers. I'm not sure if it's something that I've overlooked or if there are a couple of small errors in the guide, or a combination of both. I'll explain. When I try to mount the /var/vmail NFS volume from the file server onto the mx servers the volume mounts just fine, but if I try to cd to /var/vmail I get -bash: cd: /var/vmail: Permission denied The volume is mounted though as can be seen from : :~# mount /dev/sda1 on / type ext3 (rw,errors=remount-ro,usrquota,grpquota) tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755) proc on /proc type proc (rw,noexec,nosuid,nodev) sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) udev on /dev type tmpfs (rw,mode=0755) 192.168.1.9:/var/vmail on /var/vmail type nfs (rw,addr=192.168.1.9) In exports on the file server I have : /var/vmail 192.168.1.12(ro,insecure,subtree_check) 192.168.1.4(ro,insecure,subtree_check) 192.168.1.7(rw,no_root_squash,subtree_check) 192.168.1.5(rw,no_root_squash,subtree_check) and on the mx servers and the file server I have created the vmail user and directory with : # useradd -r -u 150 -g mail -d /var/vmail -s /sbin/nologin -c "Virtual Mailbox" vmail # mkdir /var/vmail # chmod 770 /var/vmail/ # chown vmail:mail /var/vmail/ and also when configuring postfix I changed the line : # postconf -e 'virtual_mailbox_base = /vmail' to read : # postconf -e 'virtual_mailbox_base = /var/vmail' Any help would be most appreciated. As I've tried various different combinations of above to no avail. Many thanks.