I have to question with Zimbra 3.1.2 in my var/log/zimbra.log i get this line
1) Jun 12 00:46:11 linux postfix/trivial-rewrite[5962]: warning: do not list domain subox.zapto.org in BOTH mydestination and virtual_mailbox_domains

and this other line

2)Jun 12 00:45:16 linux postfix/postfix-script: fatal: the Postfix mail system is not running

Im still able to send and recive mail from/to my domain to other accounts an to external domain like gmail

what this lines mean???