In some configurations it’s desirable to share apache2 and Zimbra on the same host. This would mean that either one of the two services shuold run on non-standard port, that is 80 and 443. If this is not an issue,
- change the ports apache2 is listening to in /etc/apache2/ports.conf
- change the portz zimbra is listening to using zmprov (zmprov gs zimbraserver zimbraMailPort 81)
But thanks to apache2‘s mod_proxy, you can have both services on the standard web ports.