diff --git a/backend/src/apis/KlicktippController.ts b/backend/src/apis/KlicktippController.ts
index c47c7b911..7c4969f45 100644
--- a/backend/src/apis/KlicktippController.ts
+++ b/backend/src/apis/KlicktippController.ts
@@ -1,40 +1,53 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import { KlicktippConnector } from './klicktippConnector'
 import CONFIG from '../config'
 
-export class KlicktippController {
-  private klicktippConnector: KlicktippConnector
+const klicktippConnector = new KlicktippConnector()
 
-  constructor(service?: string) {
-    this.klicktippConnector = new KlicktippConnector(service)
-  }
+export const signin = async (email: string, language: string): Promise<boolean> => {
+  const fields = {}
+  const apiKey = language === 'de' ? CONFIG.KLICKTIPP_APIKEY_DE : CONFIG.KLICKTIPP_APIKEY_EN
+  const result = await klicktippConnector.signin(apiKey, email, fields)
+  return result
+}
 
-  async signin(email: string, language: string): Promise<boolean> {
-    const fields = {}
-    const apiKey = language === 'de' ? CONFIG.KLICKTIPP_APIKEY_DE : CONFIG.KLICKTIPP_APIKEY_EN
-    const result = await this.klicktippConnector.signin(apiKey, email, fields)
+export const signout = async (email: string, language: string): Promise<boolean> => {
+  const apiKey = language === 'de' ? CONFIG.KLICKTIPP_APIKEY_DE : CONFIG.KLICKTIPP_APIKEY_EN
+  const result = await klicktippConnector.signoff(apiKey, email)
+  return result
+}
+
+export const userTags = async (email: string): Promise<any> => {
+  const isLogin = await loginKlicktippUser()
+  if (isLogin) {
+    const subscriberId = await klicktippConnector.subscriberSearch(email)
+    const result = await klicktippConnector.subscriberGet(subscriberId)
+    await logoutKlicktippUser()
     return result
   }
-
-  async signout(email: string, language: string): Promise<boolean> {
-    const apiKey = language === 'de' ? CONFIG.KLICKTIPP_APIKEY_DE : CONFIG.KLICKTIPP_APIKEY_EN
-    const result = await this.klicktippConnector.signoff(apiKey, email)
-    return result
-  }
-
-  async userTags(email: string): Promise<any> {
-    await this.loginKlicktippUser()
-    const subscriberId = await this.klicktippConnector.subscriberSearch(email)
-    const result = await this.klicktippConnector.subscriberGet(subscriberId)
-    console.log('The subscriber with the id: ', subscriberId, result)
-    return result
-  }
-
-  private async loginKlicktippUser() {
-    return await this.klicktippConnector.login(CONFIG.KLICKTIPP_USER, CONFIG.KLICKTIPP_PASSWORD)
-  }
-
-  async untagUser(email: string, tagid: string) {
-    await this.loginKlicktippUser()
-    return await this.klicktippConnector.untag(email, tagid)
-  }
+}
+
+export const loginKlicktippUser = async (): Promise<boolean> => {
+  return await klicktippConnector.login(CONFIG.KLICKTIPP_USER, CONFIG.KLICKTIPP_PASSWORD)
+}
+
+export const logoutKlicktippUser = async (): Promise<boolean> => {
+  return await klicktippConnector.logout()
+}
+
+export const untagUser = async (email: string, tagid: string): Promise<boolean> => {
+  const isLogin = await loginKlicktippUser()
+  if (isLogin) {
+    return await klicktippConnector.untag(email, tagid)
+  }
+  return false
+}
+
+export const tagUser = async (email: string, tagids: string): Promise<boolean> => {
+  const isLogin = await loginKlicktippUser()
+  if (isLogin) {
+    return await klicktippConnector.tag(email, tagids)
+  }
+  return false
 }
diff --git a/backend/src/apis/klicktippConnector.ts b/backend/src/apis/klicktippConnector.ts
index f72ae780b..d170e065e 100644
--- a/backend/src/apis/klicktippConnector.ts
+++ b/backend/src/apis/klicktippConnector.ts
@@ -1,3 +1,5 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
 import axios, { AxiosRequestConfig, Method } from 'axios'
 
 export class KlicktippConnector {
diff --git a/backend/src/graphql/models/CheckEmailResponse.ts b/backend/src/graphql/models/CheckEmailResponse.ts
new file mode 100644
index 000000000..be92951de
--- /dev/null
+++ b/backend/src/graphql/models/CheckEmailResponse.ts
@@ -0,0 +1,21 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+import { ObjectType, Field } from 'type-graphql'
+
+@ObjectType()
+export class CheckEmailResponse {
+  constructor(json: any) {
+    this.sessionId = json.session_id
+    this.email = json.user.email
+    this.language = json.user.language
+  }
+
+  @Field(() => Number)
+  sessionId: number
+
+  @Field(() => String)
+  email: string
+
+  @Field(() => String)
+  language: string
+}
diff --git a/backend/src/graphql/resolvers/UserResolver.ts b/backend/src/graphql/resolvers/UserResolver.ts
index d2d74d3d9..4233aadb4 100644
--- a/backend/src/graphql/resolvers/UserResolver.ts
+++ b/backend/src/graphql/resolvers/UserResolver.ts
@@ -16,14 +16,12 @@ import {
   UpdateUserInfosArgs,
 } from '../inputs/LoginUserInput'
 import { apiPost, apiGet } from '../../apis/HttpRequest'
-import { KlicktippController } from '../../apis/KlicktippController'
-import { registerMiddleware } from '../../middleware/registerMiddleware'
+import { klicktippRegistrationMiddleware } from '../../middleware/klicktippMiddleware'
 import encode from '../../jwt/encode'
+import { CheckEmailResponse } from '../models/CheckEmailResponse'
 
 @Resolver()
 export class UserResolver {
-  private connector: KlicktippController = new KlicktippController(CONFIG.KLICKTTIPP_API_URL)
-
   @Query(() => String)
   async login(@Args() { email, password }: UnsecureLoginArgs): Promise<string> {
     email = email.trim().toLowerCase()
@@ -67,7 +65,6 @@ export class UserResolver {
   }
 
   @Query(() => String)
-  @UseMiddleware(registerMiddleware)
   async create(
     @Args() { email, firstName, lastName, password, language }: CreateUserArgs,
   ): Promise<string> {
@@ -165,4 +162,14 @@ export class UserResolver {
     if (!response.success) throw new Error(response.data)
     return new CheckUsernameResponse(response.data)
   }
+
+  @Query(() => CheckEmailResponse)
+  @UseMiddleware(klicktippRegistrationMiddleware)
+  async checkEmail(@Arg('optin') optin: string): Promise<CheckEmailResponse> {
+    const result = await apiGet(CONFIG.LOGIN_API_URL + 'checkEmail/' + optin)
+    if (!result.success) {
+      throw new Error(result.data)
+    }
+    return new CheckEmailResponse(result.data)
+  }
 }
diff --git a/backend/src/middleware/klicktippMiddleware.ts b/backend/src/middleware/klicktippMiddleware.ts
new file mode 100644
index 000000000..2fdeab33d
--- /dev/null
+++ b/backend/src/middleware/klicktippMiddleware.ts
@@ -0,0 +1,15 @@
+import { MiddlewareFn } from 'type-graphql'
+import { signin } from '../apis/KlicktippController'
+
+export const klicktippRegistrationMiddleware: MiddlewareFn = async (
+  // Only for demo
+  /* eslint-disable-next-line @typescript-eslint/no-unused-vars */
+  { root, args, context, info },
+  next,
+) => {
+  // Do Something here before resolver is called
+  const result = await next()
+  // Do Something here after resolver is completed
+  signin(result.data.checkEmail.email, result.data.checkEmail.language)
+  return result
+}
diff --git a/backend/src/middleware/registerMiddleware.ts b/backend/src/middleware/registerMiddleware.ts
deleted file mode 100644
index 7b64a6243..000000000
--- a/backend/src/middleware/registerMiddleware.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-import { MiddlewareFn } from 'type-graphql'
-
-/* eslint-disable-next-line @typescript-eslint/no-unused-vars */
-export const registerMiddleware: MiddlewareFn = async ({ root, args, context, info }, next) => {
-  const result = await next()
-  // do something here
-  return result
-}