(you might need to use single ticks instead of double)
zmprov md domain.com zimbraMailCatchAllAddress ""
zmprov md domain.com zimbraMailCatchAllForwardingAddress ""
zmprov md domain.com zimbraMailTransport lmtp:server.domain.com:7025
If you continued on in that article, it goes:
so of course you will need to change those back as well if you modified them
2. We also highly recommend that, in a secondary Zimbra system, you turn off DNS lookups and internet wide message routing from the secondary host and route all mail through the primary. You can accomplish this by:
$ zmprov mcf zimbraMtaRelayHost mail.example.com
$ zmprov mcf zimbraMtaDnsLookupsEnabled FALSE