Zimbra在启动时报出以下错误信息：
Host mail.domain.com
Starting ldap...Done.
Starting zmconfigd...Done.
Starting dnscache...Done.
Starting logger...Done.
Starting mailbox...Done.
Starting memcached...Done.
Starting proxy...Done.
Starting amavis...Done.
Starting antispam...Done.
Starting antivirus...Done.
Starting opendkim...Done.
Starting snmp...Done.
Starting spell...Done.
Starting mta...Failed.
Starting saslauthd...done.
postsuper: fatal: scan_dir_push: open directory defer: Permission denied
postfix failed to start
Starting stats...Done.
Starting service webapp...Done.
Starting zimbra webapp...Done.
Starting zimbraAdmin webapp...Done.
Starting zimlet webapp...Done.
查看服务器状态：
mta Stopped
postfix is not running
经查看mta服务是由postfix启动。
1.查看系统是否已经对自带的sendmail和postfix进行关闭，端口25是否被占用，如果是请关闭并重启zimbra
2.如果不是则执行/opt/zimbra/libexec/zmfixperms (run as root)
文章参考：http://www.360viewpoint.nl/kb/technical-docs/209-zimbra-problem-after-upgrading-from-5010-to-5014