diff --git a/packages/twenty-server/src/modules/connected-account/email-alias-manager/drivers/google/services/google-email-alias-error-handler.service.ts b/packages/twenty-server/src/modules/connected-account/email-alias-manager/drivers/google/services/google-email-alias-error-handler.service.ts
index e4c095613f..43d1346ea0 100644
--- a/packages/twenty-server/src/modules/connected-account/email-alias-manager/drivers/google/services/google-email-alias-error-handler.service.ts
+++ b/packages/twenty-server/src/modules/connected-account/email-alias-manager/drivers/google/services/google-email-alias-error-handler.service.ts
@@ -1,11 +1,10 @@
 import { Injectable, Logger } from '@nestjs/common';
 
-import { GaxiosError } from 'gaxios';
-
 import {
   MessageImportDriverException,
   MessageImportDriverExceptionCode,
 } from 'src/modules/messaging/message-import-manager/drivers/exceptions/message-import-driver.exception';
+import { isGmailApiError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-api-error.util';
 import { isGmailNetworkError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-network-error.util';
 import { parseGmailApiError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/parse-gmail-api-error.util';
 import { parseGmailNetworkError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/parse-gmail-network-error.util';
@@ -17,12 +16,16 @@ export class GmailEmailAliasErrorHandlerService {
   constructor() {}
 
   public handleError(error: unknown): void {
-    this.logger.error(`Google: Error getting email aliases: ${error}`);
+    const constructorName = (error as unknown)?.constructor?.name ?? 'Unknown';
+
+    this.logger.error(
+      `Google: Error getting email aliases: ${error}, constructor: ${constructorName}`,
+    );
     if (isGmailNetworkError(error)) {
       throw parseGmailNetworkError(error);
     }
 
-    if (error instanceof GaxiosError) {
+    if (isGmailApiError(error)) {
       throw parseGmailApiError(error);
     }
 
diff --git a/packages/twenty-server/src/modules/messaging/message-folder-manager/drivers/gmail/services/gmail-folders-error-handler.service.ts b/packages/twenty-server/src/modules/messaging/message-folder-manager/drivers/gmail/services/gmail-folders-error-handler.service.ts
index 1326c74c97..e9d8a78a07 100644
--- a/packages/twenty-server/src/modules/messaging/message-folder-manager/drivers/gmail/services/gmail-folders-error-handler.service.ts
+++ b/packages/twenty-server/src/modules/messaging/message-folder-manager/drivers/gmail/services/gmail-folders-error-handler.service.ts
@@ -1,11 +1,10 @@
 import { Injectable, Logger } from '@nestjs/common';
 
-import { GaxiosError } from 'gaxios';
-
 import {
   MessageImportDriverException,
   MessageImportDriverExceptionCode,
 } from 'src/modules/messaging/message-import-manager/drivers/exceptions/message-import-driver.exception';
+import { isGmailApiError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-api-error.util';
 import { isGmailNetworkError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-network-error.util';
 import { parseGmailApiError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/parse-gmail-api-error.util';
 import { parseGmailNetworkError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/parse-gmail-network-error.util';
@@ -17,14 +16,16 @@ export class GmailFoldersErrorHandlerService {
   constructor() {}
 
   public handleError(error: unknown): void {
+    const constructorName = (error as unknown)?.constructor?.name ?? 'Unknown';
+
     this.logger.error(
-      `Gmail: Error fetching folders: ${JSON.stringify(error)}`,
+      `Gmail: Error fetching folders: ${JSON.stringify(error)}, constructor: ${constructorName}`,
     );
     if (isGmailNetworkError(error)) {
       throw parseGmailNetworkError(error);
     }
 
-    if (error instanceof GaxiosError) {
+    if (isGmailApiError(error)) {
       throw parseGmailApiError(error);
     }
 
diff --git a/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/services/gmail-message-list-fetch-error-handler.service.ts b/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/services/gmail-message-list-fetch-error-handler.service.ts
index 5f8402a5f6..ce62bd78de 100644
--- a/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/services/gmail-message-list-fetch-error-handler.service.ts
+++ b/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/services/gmail-message-list-fetch-error-handler.service.ts
@@ -1,11 +1,10 @@
 import { Injectable, Logger } from '@nestjs/common';
 
-import { GaxiosError } from 'gaxios';
-
 import {
   MessageImportDriverException,
   MessageImportDriverExceptionCode,
 } from 'src/modules/messaging/message-import-manager/drivers/exceptions/message-import-driver.exception';
+import { isGmailApiError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-api-error.util';
 import { isGmailNetworkError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-network-error.util';
 import { parseGmailApiError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/parse-gmail-api-error.util';
 import { parseGmailNetworkError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/parse-gmail-network-error.util';
@@ -17,14 +16,16 @@ export class GmailMessageListFetchErrorHandler {
   constructor() {}
 
   public handleError(error: unknown): void {
+    const constructorName = (error as unknown)?.constructor?.name ?? 'Unknown';
+
     this.logger.error(
-      `Gmail: Error fetching message list: ${JSON.stringify(error)}`,
+      `Gmail: Error fetching message list: ${JSON.stringify(error)}, constructor: ${constructorName}`,
     );
     if (isGmailNetworkError(error)) {
       throw parseGmailNetworkError(error);
     }
 
-    if (error instanceof GaxiosError) {
+    if (isGmailApiError(error)) {
       throw parseGmailApiError(error);
     }
 
diff --git a/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/utils/__tests__/is-gmail-api-error.util.spec.ts b/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/utils/__tests__/is-gmail-api-error.util.spec.ts
new file mode 100644
index 0000000000..00aaed43a7
--- /dev/null
+++ b/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/utils/__tests__/is-gmail-api-error.util.spec.ts
@@ -0,0 +1,51 @@
+import { GaxiosError } from 'gaxios';
+
+import { isGmailApiError } from 'src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-api-error.util';
+
+describe('isGmailApiError', () => {
+  it('should detect Gmail API error shape even when instanceof GaxiosError fails', () => {
+    const originalError = new GaxiosError(
+      'Rate limit exceeded',
+      {},
+      {
+        status: 429,
+        statusText: 'Too Many Requests',
+        headers: {},
+        config: {},
+        request: { responseURL: '' },
+        data: {
+          error: {
+            errors: [
+              { reason: 'rateLimitExceeded', message: 'Rate limit exceeded' },
+            ],
+          },
+        },
+      },
+    );
+
+    const serialized = JSON.parse(JSON.stringify(originalError));
+
+    expect(serialized instanceof GaxiosError).toBe(false);
+    expect(isGmailApiError(serialized)).toBe(true);
+  });
+
+  it('should detect error when data.error is a string instead of object', () => {
+    const error = {
+      response: {
+        status: 429,
+        data: {
+          error: 'userRateLimitExceeded',
+          error_description: 'User Rate Limit Exceeded',
+        },
+      },
+    };
+
+    expect(isGmailApiError(error)).toBe(true);
+  });
+
+  it('should reject network errors that have no response', () => {
+    const networkError = new Error('connect ECONNREFUSED');
+
+    expect(isGmailApiError(networkError)).toBe(false);
+  });
+});
diff --git a/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-api-error.util.ts b/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-api-error.util.ts
new file mode 100644
index 0000000000..a8559b2a5e
--- /dev/null
+++ b/packages/twenty-server/src/modules/messaging/message-import-manager/drivers/gmail/utils/is-gmail-api-error.util.ts
@@ -0,0 +1,32 @@
+import { type GaxiosError } from 'gaxios';
+import { z } from 'zod';
+
+const gmailApiErrorSchema = z.object({
+  response: z.object({
+    status: z.number().optional(),
+    data: z
+      .object({
+        error: z
+          .union([
+            z.object({
+              errors: z
+                .array(
+                  z.object({
+                    reason: z.string().optional(),
+                    message: z.string().optional(),
+                  }),
+                )
+                .optional(),
+            }),
+            z.string(),
+          ])
+          .optional(),
+        error_description: z.string().optional(),
+      })
+      .optional(),
+  }),
+});
+
+export const isGmailApiError = (error: unknown): error is GaxiosError => {
+  return gmailApiErrorSchema.safeParse(error).success;
+};