diff --git a/backend/package.json b/backend/package.json
index d31d12eda..858aa1328 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -14,7 +14,8 @@
     "dev": "cross-env TZ=UTC nodemon -w src --ext ts --exec ts-node -r tsconfig-paths/register src/index.ts",
     "lint": "eslint --max-warnings=0 --ext .js,.ts .",
     "test": "cross-env TZ=UTC NODE_ENV=development jest --runInBand --coverage --forceExit --detectOpenHandles",
-    "seed": "cross-env TZ=UTC NODE_ENV=development ts-node -r tsconfig-paths/register src/seeds/index.ts"
+    "seed": "cross-env TZ=UTC NODE_ENV=development ts-node -r tsconfig-paths/register src/seeds/index.ts",
+    "klicktipp": "cross-env TZ=UTC NODE_ENV=development ts-node -r tsconfig-paths/register src/util/klicktipp.ts"
   },
   "dependencies": {
     "@types/jest": "^27.0.2",
diff --git a/backend/src/util/klicktipp.ts b/backend/src/util/klicktipp.ts
new file mode 100644
index 000000000..c8f83acc3
--- /dev/null
+++ b/backend/src/util/klicktipp.ts
@@ -0,0 +1,28 @@
+import connection from '@/typeorm/connection'
+import { getKlickTippUser } from '@/apis/KlicktippController'
+import { User } from '@entity/User'
+
+export async function retrieveNotRegisteredEmails(): Promise<string[]> {
+  const con = await connection()
+  if (!con) {
+    throw new Error('No connection to database')
+  }
+  const users = await User.find()
+  const notRegisteredUser = []
+  for (let i = 0; i < users.length; i++) {
+    const user = users[i]
+    try {
+      await getKlickTippUser(user.email)
+    } catch (err) {
+      notRegisteredUser.push(user.email)
+      // eslint-disable-next-line no-console
+      console.log(`${user.email}`)
+    }
+  }
+  await con.close()
+  // eslint-disable-next-line no-console
+  console.log('User die nicht bei KlickTipp vorhanden sind: ', notRegisteredUser)
+  return notRegisteredUser
+}
+
+retrieveNotRegisteredEmails()