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This pull request is actually two updates. First it allows a relay maps file to be used. You could specify in MY_NETWORKS, but this is not how I think it should be done. There is an update_clientrelayhosts.sh script which will run postmap and reload postfix to reduce amount of commands sent to the container.
The second part is the same as above, except for Transport maps. Sometimes, you want to direct specific email at different mail servers. This allows this option to be used.