diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index ae7d89f..a4159a5 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -1252,18 +1252,6 @@ in
     };
   };
 
-  services.postfix.mapFiles.sender_transport = pkgs.writeText "sender_transport" ''
-      @m-labs-intl.com intltunnel:
-      * :
-  '';
-  systemd.services.postfix-rebuild-sender-relay = {
-      description = "Postfix Rebuild Sender Dependent Transport Maps";
-      serviceConfig = {
-        ExecStart = "${pkgs.postfix}/sbin/postmap /var/lib/postfix/conf/sender_transport";
-      };
-      wantedBy = [ "multi-user.target" ];
-  };
-
   mailserver = {
     enable = true;
     localDnsResolver = false;  # conflicts with dnsmasq
@@ -1274,6 +1262,9 @@ in
     certificateScheme = "acme-nginx";
   } // (import /etc/nixos/secret/email_settings.nix);
   services.postfix = {
+    mapFiles.sender_transport = pkgs.writeText "sender_transport" ''
+        @m-labs-intl.com intltunnel:
+    '';
     config = {
       sender_dependent_default_transport_maps = "hash:/var/lib/postfix/conf/sender_transport";
     };
@@ -1281,8 +1272,8 @@ in
       type = "unix";
       command = "smtp";
       args = [
-        "-o" "smtp_bind_address=10.47.3.1"
         "-o" "inet_interfaces=10.47.3.1"
+        "-o" "smtp_helo_name=mail.m-labs-intl.com"
         "-o" "inet_protocols=ipv4"
        ];
     };