sudo mkdir -p /choose/postal/app sudo wget sudo tar xvf most current.tgz -C /opt/postal/app sudo chown -R postal:postal /choose/postal sudo ln -s /choose/postal/application/bin/postal /usr/bin/postal You will detect That is an instance domain, but it is currently your domain since you improved it in the postal config file. SPF information are https://it-support-services78888.myparisblog.com/27159923/postal-smtp-setup-can-be-fun-for-anyone