diff --git a/package.json b/package.json
index 53eff8b266c2514c7fb65eb12bf03cd8109d7976..78d2bb4106093f642e5e0f22d0ce5d86178b5cdf 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "mysql": "^2.17.1",
     "mysql2": "^2.2.5",
     "nodemailer": "^6.3.1",
+    "nodemailer-ntlm-auth": "^1.0.1",
     "passport": "0.3.2",
     "passport-saml": "^2.1.0",
     "pug": "^3.0.2"