anchor.diff:              ${pkgs.coreutils}/bin/chown root:root /var/spool/mail
               ${pkgs.coreutils}/bin/chmod a+rwxt /var/spool/mail
   
  -            ln -sf ${pkgs.postfix}/share/postfix/conf/* /var/postfix/conf
  +            ln -sf "${pkgs.postfix}/share/postfix/conf/"* /var/postfix/conf
   
               ln -sf ${aliasesFile} /var/postfix/conf/aliases
               ln -sf ${virtualFile} /var/postfix/conf/virtual
  
positive.code:             ${pkgs.postfix}/sbin/postalias -c /var/postfix/conf /var/postfix/conf/aliases
              ${pkgs.postfix}/sbin/postmap -c /var/postfix/conf /var/postfix/conf/virtual
  
              exec ${pkgs.postfix}/sbin/postfix -c /var/postfix/conf start
            ''; # */
  
          preStop = ''
              exec ${pkgs.postfix}/sbin/postfix -c /var/postfix/conf stop
          '';
  
        };
  
negative.code:       # accurate way is unlikely to be better.
        { description = "Postfix mail server";
  
          wantedBy = [ "multi-user.target" ];
          after = [ "network.target" ];
  
          daemonType = "fork";
  
          environment.TZ = config.time.timeZone;
  
          preStart =
            ''
  