Mac Mail Mailboxes Disappeared

If your Mac mail mailboxes disappeared, after upgrading the macOS or moving your data to a new Mac, then you can use the Show/Hide button to resolve it. Apple has added this button to either show or hide a mailbox folder. By default, this button is not visible, which means it is invisible. To access the Show/Hide button, move your system mouse cursor over the folder you wish to show.hide. Now, the Show button will appear and you need to click it. 

Now, let’s see the other causes for this issue:

  • Step 1: Malware or virus attack on your system.
  • Step 2: Deleted mailboxes unknowingly or intentionally.
  • Step 3: Improper configuration of the mail account.
  • Step 4: Bug entered during the upgrade process.

To fix the Mac Mail Mailboxes disappeared issue, carry out any of the solutions given here.

Solution 1: Rebuilding Apple Mail Mailbox 

  • Step 1: Launch the Apple Mail application on your device.
  • Step 2: From the list of folders, select the folder that you wish to rebuild.
  • Step 3: Click the Mailbox menu followed by Rebuild. 
  • Step 4: Check if the issue is resolved. If not, try the next solution.

Solution 2: Restoring Apple Mail Account

  • Step 1: You can restore your Apple Mail account using the Preferences option.
  • Step 2: On your Mac Mail application screen, click the Mail menu.
  • Step 3: Go to the Preferences option.
  • Step 4: In the window that opens next, select the Account option.
  • Step 5: Disable and again select the Enable this account option.
  • Step 6: Finally, click the Save button.
  • Step 7: Now, check if the Mac mail mailboxes disappeared issue is resolved.

Solution 3: Disable The Message Filter Option

  • Step 1: Click the View menu on the Apple Mail application screen.
  • Step 2: Locate the Enable Message Filter heading option and click on it.
  • Step 3: Now, the Message filter option will be disabled.
  • Step 4: Check if the issue has been resolved. If not, try the next method.

Solution 4: Re-sync The Mac Mail’s Inbox

  • Step 1: Click on the Mailbox option on your Mac Mail.
  • Step 2: Right-click on the Mailbox and select the Synchronize option.
  • Step 3: Now, check if the Mac mail mailboxes disappeared issue is resolved.