diff --git a/packages/hoppscotch-sh-admin/src/helpers/errors.ts b/packages/hoppscotch-sh-admin/src/helpers/errors.ts
index 5473ec528..f66559ea3 100644
--- a/packages/hoppscotch-sh-admin/src/helpers/errors.ts
+++ b/packages/hoppscotch-sh-admin/src/helpers/errors.ts
@@ -7,3 +7,21 @@ export const UNAUTHORIZED = 'Unauthorized' as const;
 
 // Sometimes the backend returns Unauthorized error message as follows:
 export const GRAPHQL_UNAUTHORIZED = '[GraphQL] Unauthorized' as const;
+
+/**
+ * Email not found
+ */
+export const EMAIL_NOT_FOUND = 'email/not_found';
+
+/**
+ * Request Failed
+ */
+export const REQ_FAILED = 'request/failed';
+
+export const INVALID_EMAIL = 'invalid/email' as const;
+
+/**
+ * Subscriber already exists
+ * (NewsletterService)
+ */
+export const SUBSCRIBER_ALREADY_EXISTS = 'newsletter/subscriber_already_exists';
diff --git a/packages/hoppscotch-sh-admin/src/helpers/listmonk.ts b/packages/hoppscotch-sh-admin/src/helpers/listmonk.ts
new file mode 100644
index 000000000..31a019a25
--- /dev/null
+++ b/packages/hoppscotch-sh-admin/src/helpers/listmonk.ts
@@ -0,0 +1,147 @@
+import * as E from 'fp-ts/Either';
+import { EmailCodec } from '~/helpers/Email';
+import axios, { AxiosResponse } from 'axios';
+import {
+  REQ_FAILED,
+  EMAIL_NOT_FOUND,
+  INVALID_EMAIL,
+  SUBSCRIBER_ALREADY_EXISTS,
+} from '~/helpers/errors';
+
+enum HttpStatus {
+  BAD_REQUEST = 400,
+  CONFLICT = 409,
+  NOT_FOUND = 404,
+}
+
+export type ResponseError = {
+  message: string;
+  statusCode: HttpStatus;
+};
+
+const handleResponse = (response: AxiosResponse) => {
+  if (response.status >= 200 && response.status < 300) {
+    return E.right(response.data);
+  } else {
+    return E.left(<ResponseError>{
+      statusCode: HttpStatus.BAD_REQUEST,
+      message: REQ_FAILED,
+    });
+  }
+};
+
+const listmonkConfig = {
+  baseURL: `sdsd`,
+  apiURL: `sfs`,
+  listmonkUsername: `fsdfs`,
+  listmonkPassword: `fdsf`,
+  newsletterListID: parseInt('fasf', 10),
+};
+
+const listmonk = axios.create({
+  baseURL: listmonkConfig.apiURL,
+  auth: {
+    username: listmonkConfig.listmonkUsername,
+    password: listmonkConfig.listmonkPassword,
+  },
+});
+const castToSubscriber = (subscriberResponse: any) => {
+  return {
+    id: subscriberResponse.id,
+    created_at: subscriberResponse.created_at,
+    updated_at: subscriberResponse.updated_at,
+    uuid: subscriberResponse.uuid,
+    email: subscriberResponse.email,
+    name: subscriberResponse.name,
+    status: subscriberResponse.status,
+    lists: subscriberResponse.lists.map((list: any) => ({
+      subscription_status: list.subscription_status,
+      subscription_created_at: list.subscription_created_at,
+      subscription_updated_at: list.subscription_updated_at,
+      id: list.id,
+    })),
+  };
+};
+
+const fetchSubscriberDetailsByEmail = async (emailID: string) => {
+  const subscribersURL = `${listmonkConfig.apiURL}/subscribers`;
+  const params = {
+    query: `email = '${emailID}'`,
+  };
+  try {
+    const response = await listmonk.get(subscribersURL, {
+      params: params,
+    });
+    if (response.status >= 200 && response.status < 300) {
+      // check length of response results array
+      if (!response.data.data.results.length) {
+        return E.left(<ResponseError>{
+          statusCode: HttpStatus.NOT_FOUND,
+          message: EMAIL_NOT_FOUND,
+        });
+      }
+
+      // fetch subscriber data from response results array object and typecast to `Subscriber` type.
+      const subscriberRes = response.data.data.results[0];
+      const subscriber = castToSubscriber(subscriberRes);
+      return E.right(subscriber);
+    } else {
+      return E.left(<ResponseError>{
+        statusCode: HttpStatus.BAD_REQUEST,
+        message: REQ_FAILED,
+      });
+    }
+  } catch (err: any) {
+    return E.left(<ResponseError>{
+      message: err.response.statusText,
+      statusCode: err.response.status,
+    });
+  }
+};
+
+export const addSubscriberNewsletterList = async (
+  emailID: string,
+  subscriberName: string
+) => {
+  // Validate email
+  const isEmailValid = EmailCodec.is(emailID);
+  if (!isEmailValid)
+    return E.left(<ResponseError>{
+      message: INVALID_EMAIL,
+      statusCode: HttpStatus.BAD_REQUEST,
+    });
+
+  // Check if subscriber already exists
+  const subscriber = await fetchSubscriberDetailsByEmail(emailID);
+  if (E.isRight(subscriber)) {
+    return E.left(<ResponseError>{
+      message: SUBSCRIBER_ALREADY_EXISTS,
+      statusCode: HttpStatus.CONFLICT,
+    });
+  }
+
+  // Add a new subscriber to newsletter
+  const addSubscriberURL = `${listmonkConfig.apiURL}/subscribers`;
+  const reqData = {
+    email: `${emailID}`,
+    name: `${subscriberName}`,
+    status: 'enabled',
+    lists: [listmonkConfig.newsletterListID],
+    preconfirm_subscriptions: true,
+  };
+
+  try {
+    const response = await listmonk.post(addSubscriberURL, reqData, {
+      headers: {
+        'Content-Type': 'application/json',
+      },
+    });
+
+    return handleResponse(response);
+  } catch (err: any) {
+    return E.left(<ResponseError>{
+      message: err.response.statusText,
+      statusCode: err.response.status,
+    });
+  }
+};