https://manpages.ubuntu.com/manpages/resolute/man3/Mail%3A%3AMtPolicyd%3A%3APlugin%3A%3APostfixMap.3pm.html
Ubuntu Manpage: Mail::MtPolicyd::Plugin::PostfixMap - mtpolicyd plugin for accessing a postfix...
mtpolicyd plugin for accessing a postfix access map
ubuntumanpagemailpluginaccessing