Email Sync Problems

How to Fix Emails Missing in Apple Mail on a New Mac

Maira MehtabMaira Mehtab Oct 16, 2026 870 views

Question details

Users are unable to see their emails in Apple Mail on a newly set-up Mac, despite the emails synchronizing correctly on other devices.

How to Fix Emails Missing from Apple Mail on a New Mac
Product
Apple Mail
Device & OS
macOS
Scenario
Setting up a new Mac and attempting to sync existing email accounts via the native Apple Mail client.
Observed behavior
Emails are visible on previously connected devices (like an iPhone or an older laptop) but fail to appear or synchronize in the Apple Mail application on the new Mac.
Before you start

Ensure your new Mac is connected to a stable internet connection and that you have your email account credentials (username, password, and server settings) readily available before troubleshooting.

Solution 1Recommended

Verify Account Protocol (IMAP vs. POP)

Ensure your email account is configured to use IMAP instead of POP, allowing your emails to sync seamlessly across multiple devices.

Email accounts can be set up using either POP or IMAP protocols. If your older devices are using POP, they might be downloading and removing emails from the server, leaving nothing for your new Mac to download. Switching to IMAP ensures emails remain on the server and synchronize across all devices.

1
Open Apple Mail Settings

Launch the Apple Mail application on your new Mac. From the top menu bar, click on 'Mail' and select 'Settings' (or 'Preferences' on older macOS versions).

2
Select the Email Account

Navigate to the 'Accounts' tab and select the problematic email account from the left sidebar.

3
Check Server Settings

Click on the 'Server Settings' tab to verify the incoming mail server type. Ensure it is configured as an IMAP account rather than POP.

Verify Account Protocol (IMAP vs. POP)
IMAP Synchronization: IMAP perfectly synchronizes emails across all your devices, meaning actions like reading, moving, or deleting an email on your Mac will reflect on your iPhone as well.
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Frequently Asked Questions

Why are my emails showing on my iPhone but not my Mac?

This typically occurs if the Mac is using different server settings (such as POP instead of IMAP), if the mailbox data needs rebuilding, or if your email provider requires additional authentication for the newly connected Mac.

How do I know if I am using IMAP or POP in Apple Mail?

To check your protocol, go to Mail > Settings > Accounts, select your email account, and look under the Server Settings tab. The incoming mail server field will explicitly state whether it is an IMAP or POP server.

Will rebuilding my mailbox in Apple Mail delete my emails?

No, rebuilding a mailbox simply clears the local cache on your Mac and forces Apple Mail to re-download all existing messages and attachments directly from the email server.

What should I do if my emails are still missing after rebuilding?

If emails are still missing, you should verify your account credentials, log into your webmail to ensure the emails exist on the server, check for any provider-side security blocks, or contact Apple Support for further diagnostics.