Allow systems with selected ip addresses to relay email through Zimbra without needing authentication

There are two ways to set and check this

Global – applied to all servers

set
zmprov mcf zimbraMtaMyNetworks “10.1.1.0/24 [fe80::5054::]/64 127.0.0.0/8 [::1]/128”

check
zmprov gcf zimbraMtaMyNetworks

Per server. Note – the per server setting will override the global setting unless if the server setting is set blank

check
zmprov gs `zmhostname` zimbraMtaMyNetworks

set
zmprov ms `zmhostname` zimbraMtaMyNetworks “10.1.1.0/24 [fe80::5054::]/64 127.0.0.0/8 [::1]/128”

Important note 1: If the server value is set to a blank value i.e. “” the command zmprov gs `zmhostname` zimbraMtaMyNetworks will return the global value

Important note:

At a minimum set the global value to be 

127.0.0.0/8 [::1]/128

so that a server can relay internal emails as needed. Also include the local IP addresses in any set of values used (Global or Server)