First, i setup the zimbra server success. Then i add a firewall front of the zimbra server, after that can send but can't receive..........
there are some settings on my server..
127.0.0.1 localhost.localdomain localhost
192.168.3.28 mydomain.org mydomain.org
# cat /etc/sysconfig/network
# cat /etc/resolv.conf
; generated by /sbin/dhclient-script