diff --git a/modules/nixos/zulip.nix b/modules/nixos/zulip.nix
index 34afb12..ee063c3 100644
--- a/modules/nixos/zulip.nix
+++ b/modules/nixos/zulip.nix
@@ -19,7 +19,11 @@
     };
 
     # settings
-    zulipSettings = {
+    zulipSettings = rec {
+      EMAIL_USE_TLS = true;
+      EMAIL_PORT = 587;
+      ADD_TOKENS_TO_NOREPLY_ADDRESS = false;
+      NOREPLY_EMAIL_ADDRESS = ZULIP_ADMINISTRATOR;
       OPEN_REALM_CREATION = true;
       EXTERNAL_HOST = config.services.zulip.host;
       ZULIP_ADMINISTRATOR = "admin@${config.networking.domain}";