diff --git a/nixos/modules/mailman.nix b/nixos/modules/mailman.nix
index f4ecd0e..1c8eaba 100644
--- a/nixos/modules/mailman.nix
+++ b/nixos/modules/mailman.nix
@@ -32,7 +32,6 @@ in {
         config = {
           transport_maps = ["hash:/var/lib/mailman/data/postfix_lmtp"];
           local_recipient_maps = ["hash:/var/lib/mailman/data/postfix_lmtp"];
-          proxy_interfaces = "130.83.2.184";
           smtputf8_enable = "no"; # HRZ does not know SMTPUTF8
         };
         relayHost = "mathebau.de"; # Relay to mail vm which relays to HRZ (see https://www.hrz.tu-darmstadt.de/services/it_services/email_infrastruktur/index.de.jsp)