I'm trying to remove X-Originating-IP as it's using the IP address of the router on the edge of our network, and the reverse DNS doesn't resolve to the hostname of our Zimbra server. I think this is causing some of our outbound email to be rejected by servers.

I set zimbraSmtpSendAddOriginatingIP correctly on both mta's:
zimbra@mta1:~$ zmprov gacf | grep Originating
zimbraSmtpSendAddOriginatingIP: FALSE

Performed a zmcontrol restart on both mta's as well.

This header is showing up on email to my Yahoo account:
X-Originating-IP: [xx.xx.xxx.xx]

I would rather not have that ip address showing up in the headers at all. Any way to do that?