Hello all trying to add a remote relay host to Zimbra, but it is not working get this error

Message: Error! non-null host address bits in 184.70.118.138/30, perhaps you should use 184.70.118.136 instead!
Additional information about MTA Trusted Networks configuration can be found at

ZimbraMtaMyNetworks - Zimbra :: Wiki

I read through the wiki and the link to an explanation about cider

This is the info given to me by ISP which i am pretty sure translates into 184.70.118.138/30

IP address 184.70.118.138
subnetmask 255.255.255.252

I have also tried this through the command line and get this error

zimbra@mx1:/root$ zmprov modifyServer mx1.computerking.ca zimbraMtaMyNetworks '127.0.0.0/8 10.0.0.0/8 184.70.118.138/30' postfix reload
ERROR: account.INVALID_ATTR_NAME (invalid attr name: [LDAP: error code 17 - postfix: attribute type undefined])