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Quick Answer

Open System Settings > Internet Accounts on your Mac, delete your Exchange account, and add it back to force Apple Mail to trigger the modern MFA login window.

How to Fix Apple Mail Not Connecting After Enabling MFA ​

Estimated Time to Fix: 5 minutes

Applies to: macOS (Apple Mail)
Article Type: Troubleshooting
Last Updated: 2026-07-20

Summary ​

When your company enables Multi-Factor Authentication (MFA), it changes how applications are allowed to sign in. The default Apple Mail app on your Mac often gets confused during this transition. Instead of showing you the new Microsoft or Google sign-in window to approve the MFA prompt, it endlessly rejects your password. Here is how to force Apple Mail to recognize the new security settings.

Prerequisites ​

  • You must know your current work email address and password.
  • You need your phone nearby to approve the MFA prompt.

Instructions ​

1. Delete the Stale Account ​

The fastest and most reliable way to fix this is to remove the email account from your Mac and add it back. This forces Apple Mail to download the newest security settings. Do not worry; this will not delete your actual emails. Your emails live safely in the cloud.

  1. Click the Apple logo () in the top left corner of your screen.
  2. Select System Settings (or System Preferences on older Macs).
  3. Scroll down the left sidebar and click Internet Accounts.
  4. Click on your work email account in the list (usually labeled "Exchange" or "Google").
  5. Click the Delete Account button at the bottom.
  6. Confirm that you want to delete it.

2. Re-Add the Account Properly ​

Now you need to add it back so the modern authentication window triggers.

  1. Still in the Internet Accounts menu, click Add Account.
  2. Select the correct service:
    • Choose Microsoft Exchange if your company uses Microsoft 365/Outlook.
    • Choose Google if your company uses Google Workspace/Gmail.
  3. Type in your name and your work email address, then click Sign In.
  4. Crucial Step: A popup will ask if you want to "Sign in to your Exchange account using Microsoft" (or Google). You must click Sign In. Do not click "Configure Manually".
  5. A web browser window will pop up. Enter your password here.
  6. Approve the MFA prompt on your phone (text message or authenticator app).

3. Sync Your Mail ​

Once authenticated, Apple will ask what apps you want to sync.

  1. Ensure the toggle for Mail is turned on.
  2. You can also optionally turn on Contacts, Calendars, and Reminders.
  3. Click Done.
  4. Open the Apple Mail app. It will say "Downloading Messages" at the bottom left. Give it a few minutes to pull down your inbox.

Troubleshooting ​

WARNING

If your Mac is very old (running macOS 10.13 High Sierra or older), Apple Mail physically does not support modern MFA. You will be forced to use the Outlook App or access your email through a web browser instead.

Symptom / ErrorPotential CauseSolution
"Unable to verify account name or password"Wrong service selectedMake sure you selected "Microsoft Exchange" and not the generic "Mail account" option when adding it back.
My subfolders are emptySync in progressApple Mail downloads the main Inbox first, then works on subfolders in the background. Leave the app open and connected to Wi-Fi for 30 minutes to finish syncing.