Configuring mynetwork maps in Zimbra
Default limit for mynetworks in postifx is ~4000 characters. If you have large list of networks/IPs to allow in mynetworks, then using zimbraMtaMyNetworks does not helps. Further zimbraMTAMyNetworks has a character limit of 10240.
Solution is to use mynetworks_maps in postfix. Below steps are tested on ZCS 8.7.11.
su - zimbra zmprov ms `zmhostname` zimbraMtaMyNetworks "lmdb:/opt/zimbra/conf/network_table"
Configure the list of IPs in /opt/zimbra/conf/network_table in below format. Make sure to include server's ethernet and localhost IPs.
127.0.0.1 OK <SERVERIP> OK 126.96.36.199 OK 188.8.131.52 OK
Create a hashmap with:
Change below line in /opt/zimbra/conf/amavisd.conf.in to help amavisd process mynetwork maps.
@mynetworks = qw( %%zimbraMtaMyNetworks%% );
@mynetworks_maps = qw( read_array('/opt/zimbra/conf/network_table'));
This external link contains more information about formatting.