diff --git a/src/api/hooks/Mail/useGetMailBusiness.tsx b/src/api/hooks/Mail/useGetMailBusiness.tsx
index 38f2a41..abf32af 100644
--- a/src/api/hooks/Mail/useGetMailBusiness.tsx
+++ b/src/api/hooks/Mail/useGetMailBusiness.tsx
@@ -6,18 +6,20 @@ import { useQuery } from '@tanstack/react-query';
 export const getMailPath = (page: number, size: number) =>
   `${BASE_URL}/emails?page=${page}&size=${size}`;
 
-const token = sessionStorage.getItem('accessToken');
-
-const apiClient = axios.create({
-  baseURL: BASE_URL,
-  headers: {
-    Authorization: `Bearer ${token}`,
-    Job: `business`,
-  },
-});
+const createApiClient = () => {
+  const token = sessionStorage.getItem('accessToken');
+  return axios.create({
+    baseURL: BASE_URL,
+    headers: {
+      Authorization: `Bearer ${token}`,
+      Job: 'business',
+    },
+  });
+};
 
 const getMailBusiness = async (page: number, size: number) => {
   try {
+    const apiClient = createApiClient();
     const response = await apiClient.get<MailListResponse>(getMailPath(page, size));
     return response.data;
   } catch (error) {
diff --git a/src/api/hooks/Mail/useGetMailUniv.tsx b/src/api/hooks/Mail/useGetMailUniv.tsx
index 79e5e7d..939296d 100644
--- a/src/api/hooks/Mail/useGetMailUniv.tsx
+++ b/src/api/hooks/Mail/useGetMailUniv.tsx
@@ -6,18 +6,20 @@ import { useQuery } from '@tanstack/react-query';
 export const getMailPath = (page: number, size: number) =>
   `${BASE_URL}/emails?page=${page}&size=${size}`;
 
-const token = sessionStorage.getItem('accessToken');
-
-const apiClient = axios.create({
-  baseURL: BASE_URL,
-  headers: {
-    Authorization: `Bearer ${token}`,
-    Job: `univ`,
-  },
-});
+const createApiClient = () => {
+  const token = sessionStorage.getItem('accessToken');
+  return axios.create({
+    baseURL: BASE_URL,
+    headers: {
+      Authorization: `Bearer ${token}`,
+      Job: 'univ',
+    },
+  });
+};
 
 const getMailUniv = async (page: number, size: number) => {
   try {
+    const apiClient = createApiClient();
     const response = await apiClient.get<MailListResponse>(getMailPath(page, size));
     return response.data;
   } catch (error) {
diff --git a/src/api/hooks/Mail/usePostMail.tsx b/src/api/hooks/Mail/usePostMail.tsx
index ac86a5d..c76d829 100644
--- a/src/api/hooks/Mail/usePostMail.tsx
+++ b/src/api/hooks/Mail/usePostMail.tsx
@@ -4,17 +4,21 @@ import { BASE_URL } from '../..';
 import { useMutation } from '@tanstack/react-query';
 
 export const postMailPath = () => `${BASE_URL}/save-email`;
-const token = sessionStorage.getItem('accessToken');
 
-const apiClient = axios.create({
-  baseURL: BASE_URL,
-  headers: {
-    Authorization: `Bearer ${token}`,
-  },
-});
+const createApiClient = () => {
+  const token = sessionStorage.getItem('accessToken');
+
+  return axios.create({
+    baseURL: BASE_URL,
+    headers: {
+      Authorization: `Bearer ${token}`,
+    },
+  });
+};
 
 const postMail = async (mailInput: MailPostData) => {
   try {
+    const apiClient = createApiClient();
     const response = await apiClient.post<number>(postMailPath(), mailInput);
     return response.data;
   } catch (error) {