diff --git a/pages/admin/reviewers/index.tsx b/pages/admin/reviewers/index.tsx
index b899d15..3e16a7f 100644
--- a/pages/admin/reviewers/index.tsx
+++ b/pages/admin/reviewers/index.tsx
@@ -1,3 +1,5 @@
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faSpinner } from '@fortawesome/free-solid-svg-icons'
 import { useEffect, useState } from 'react'
 import SetDropdown from '../../../components/Admin/SetDropdown'
 import Loading from '../../../components/Loading'
@@ -6,6 +8,7 @@ import Roles from '../../../constants/roles'
 import AdminLayout from '../../../layouts/admin/admin-layout'
 import { Users } from '../../../types'
 import { getUsersByRole } from '../../api/getUserDetails'
+import { sendRevSetMails } from '../../api/updateReviewSet'
 import { updateUserSets } from '../../api/updateUserSets'
 
 type SelectedSetsType = { [key: string]: Array<string> }
@@ -14,6 +17,7 @@ function ReviewersList() {
   const [reviewers, setReviewers] = useState<Users>({})
   const [pageReady, setPageReady] = useState<boolean>(false)
   const [selectedSets, setSelectedSets] = useState<SelectedSetsType>()
+  const [loading, setLoading] = useState(false)
 
   useEffect(() => {
     getUsersByRole(Roles.REVIEWER)
@@ -29,7 +33,6 @@ function ReviewersList() {
       .catch(() => alert('Try again, network error!'))
       .finally(() => setPageReady(true))
   }, [])
-  console.log(selectedSets)
 
   return (
     <AdminLayout>
@@ -128,6 +131,26 @@ function ReviewersList() {
                 ))}
               </tbody>
             </table>
+            <button
+              className="text-white text-base md:text-lg py-1 px-3 mt-10 rounded-lg bg-red-850"
+              onClick={() => {
+                if (loading) return
+
+                setLoading(true)
+                sendRevSetMails().finally(() => setLoading(false))
+              }}
+            >
+              {!loading ? (
+                'Send Credential Mails'
+              ) : (
+                <FontAwesomeIcon
+                  icon={faSpinner}
+                  width={30}
+                  spin={true}
+                  className="mx-5"
+                />
+              )}
+            </button>
           </div>
         </div>
       ) : (
diff --git a/pages/api/updateReviewSet.ts b/pages/api/updateReviewSet.ts
index 131d40f..5e22a9f 100644
--- a/pages/api/updateReviewSet.ts
+++ b/pages/api/updateReviewSet.ts
@@ -1,8 +1,46 @@
 import path from 'path'
-import { firestore } from '../../firebase'
+import firebase, { firestore } from '../../firebase'
+import { User, userController } from '../../classes/user'
 
 export const updateReviewSet = (userId: string, set: string) => {
   return firestore
     .doc(path.join('admin_portal_data', userId))
     .update({ review_set: set })
 }
+
+export const sendRevSetMails = () => {
+  return firestore
+    .collection('users')
+    .where('role', '==', 'REVIEWER')
+    .withConverter(userController)
+    .get()
+    .then((users: firebase.firestore.QuerySnapshot<User>) => {
+      // this code needs update because if users are more than 20,
+      // request will be closed and not able to wait for each mail request
+      users.docs.map(
+        async (
+          userData: firebase.firestore.QueryDocumentSnapshot<User>,
+          index: number,
+        ) => {
+          const user = userData.data()
+          setTimeout(() => {
+            fetch(
+              process.env.NEXT_PUBLIC_REVIEWER_CRED_MAIL_LINK +
+                new URLSearchParams({
+                  email: user.email,
+                  name: user.name,
+                  sets: user.sets.join(', '),
+                }),
+            )
+          }, 1000 * index)
+
+          if (index == users.docs.length - 1) {
+            setTimeout(() => {
+              console.log('Completed! Mail sent to all reviewers.')
+            }, 1000 * index)
+          }
+        },
+      )
+    })
+    .catch((error) => console.log(error))
+}