Regarding performance, According to DNSperf.com, Cloudflare’s DNS service led its peers in all but two regions in August 2020. Note which the docker setup mounts /choose/postal/config as /config so any whole Listing paths mentioned in postal.yml will possible should begin with /config and not /opt/postal/config This articles is saved https://www.hostscheap.com/python-web-server-setup-service