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Simply null out the values/return them to their previous:
Yes that's LMTP not SMTP.
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 null/change those back to TRUE 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