Okay so did this just start happening, or has been like it for a while ? Please post output from
Code:
cat /etc/hosts
cat /etc/resolv.conf
dig _domain_ mx <- replace domain with your own
dig _domain_ ns <- replace domain with your own
host `hostname` <- note backticks not double quotes
do you have any other errors in /var/log/zimbra.log referring to Postfix ?