Macos Mail App Not Syncing Emails Fix

Summary

This guide helps you troubleshoot and resolve: Macos Mail App Not Syncing Emails Fix. Follow the steps below to fix the issue.

Common Causes

If your Mac's Mail app is not sending, receiving, or updating messages, it is usually caused by a temporary network glitch, an incorrect account setting, or an outdated version of macOS. This guide walks you through the most effective ways to resolve email synchronisation issues for small business and home office users.

Quick Fix Steps

1. Restart your Mac to clear temporary system processes.
2. Check your internet connection by opening a website in Safari.
3. Open the Mail app and select Mailbox from the top menu, then click Get All New Mail.
4. Quit the Mail app completely and reopen it.

Detailed Instructions

1. Check Your Online Status

Mail will not sync if the Mac is offline or if the account is set to offline mode.

1. Open the Mail app.
2. Click Mailbox in the top menu bar.
3. Ensure Take All Accounts Offline is not selected. If it is, click it to toggle it off.
4. Click Get All New Mail to force a synchronisation.

2. Verify Account Settings

Incorrect server details or authentication settings can prevent emails from syncing.

1. Open Mail and click Mail in the top menu, then select Settings (or Preferences on older macOS versions).
2. Click the Accounts tab.
3. Select your email account from the list on the left.
4. Check that your email address and password are correct.
5. Review the Server Settings tab to ensure incoming and outgoing mail server details match those provided by your email provider.
6. Close the settings window and test if new emails appear.

Tip: If you recently changed your email password, you must update it in the Mail app settings, or the app will be unable to connect to the server.

3. Rebuild the Mailbox

If emails are missing or folders are not updating, rebuilding the mailbox can repair the local index.

1. Open the Mail app.
2. In the sidebar, select the mailbox that is not syncing.
3. Click Mailbox in the top menu bar.
4. Select Rebuild.
5. Wait for the process to complete. This may take several minutes depending on the size of your mailbox.

4. Update macOS

Running an outdated version of macOS can cause compatibility issues with email servers.

1. Click the Apple menu () in the top-left corner of your screen.
2. Select System Settings (or System Preferences).
3. Click General, then select Software Update.
4. If an update is available, click Update Now or Restart Now.

Caution: Ensure you have a recent backup via Time Machine before performing a major macOS system update.

Troubleshooting

Connection Issues

If Mail still will not sync, the problem may be your network or a firewall blocking the connection.

• Restart your Wi-Fi router.
• Temporarily disable any third-party firewall or VPN software to see if Mail begins syncing.
• Try connecting your Mac to a different network, such as a mobile hotspot, to rule out local network issues.

Remove and Re-add the Account

If a specific account remains broken, removing and re-adding it often resolves deep-seated configuration errors.

1. Open Mail settings and go to Accounts.
2. Select the problematic account and click the minus (-) button to remove it.
3. Click the plus (+) button to add the account again.
4. Enter your email address and password, then follow the on-screen prompts to complete setup.

If you host with us, you don't need to do this yourself — just Open a Ticket and our Brisbane team will get it sorted. If you have completed these steps and your Mail app is still not syncing, please Open a Ticket for further assistance from our Brisbane support team.

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