How to Fix an Error Occurred While Moving Messages to Mailbox in Catalina

A common error “An error occurred while moving messages to mailbox “(null)” hits iMac Catalina after particular manual and technical errors. The failure is likely to occur when mails from drafts, junks, and spams are not assigned correctly. There has been a discussion on the Apple forum lately on how to fix an error that occurred while moving messages to the mailbox in Catalina. Now, we are interested in breaking down the issue. The following image is the error seen in Catalina recently.

How to Fix an Error Occurred While Moving Messages to Mailbox in Catalina



The scenario where you notice an error: When you delete your email from Apple mailbox in Catalina, the email gets deleted but does not shows up in the trash list. Switching over to the trash box, following shows an error.

Solution 1: Run Apple mail in safe mode

Step 1: Close all the running applications from the background.

Step 2: Now, launch the Apple Mail Program.

Step 3: Click on the “Mail” and quit mail.

Step 4: After that, hold the shift key and open the Apple Mail program again.

Step 5: Now, you can run Apple mail service in safe mode. This time make sure to check if the error persists.

Solution 2: Mail server settings

Step 1: Open the Apple Mail program.

Step 2: Hover towards the mail tab, there find the “preference” option; click on it.

Step 3: Now, go to account and choose your Apple account.

Step 4: On the Accounts menu, find “Advanced IMAP settings” and click on the button.

Step 5: Now, enter INBOX in the field of “IMAP Path Prefix.”

Updating the IMAP path prefix in Mac Mail

Step 5: Also, you would want to go to “Mailbox Behaviors” and choose to check-mark the following fields.

mailbox behaviors

Solution 3: Rebuild mailbox

Step 1: Go to the Apple mailbox.

Step 2: Right-click on the “Mailbox” tab and select “Rebuild” from the generated options.

Rebuild a mailbox in Mac Mail How to Fix an Error Occurred While Moving Messages to Mailbox in Catalina

Solution 4: Assign folders to the mailbox

The main reason for the error to occur is due to unassigned folders on the mailbox for junks, trash, and spam emails. Assigning folder should solve an issue. Follow the steps below.

Step 1: Initially, launch the Apple Mailbox application.

Step 2: Now, select any folders on the mailbox, either it’s spam, junks, or spam you would like to assign a folder to. After one is done, you can serially copy the steps to other fields.

Step 3: For example, we have selected the Spam folder. Now click on the mailbox from the above tabs.

Step 4: You should see a couple of options to select, on the second-last option, you would see the title of “Use this Mailbox As,” click on it.

Step 5: Now, if you are selecting spam for the cause, then click on the “Junk Mailbox” option.

Step 6: Repeat the same procedure for Trash, Draft, Sent, and Archive.

use this mailbox as junk

If any of these solutions is not absolute in your case, try using the MBOX converter tool. This will surely solve an issue regarding Apple mailbox.


Download the application and select to run the application on file selection or folder selection mode. After the successful scanning, it shows the attachments in your mailbox. You can either view the attachments there or export it to different formats. It supports exporting MBOX to Office 360 and Live Exchange server with multiple control over functions.

Now, you should be aware of how to fix an error that occurred while moving messages to the mailbox in Catalina. Find more of the content in ThatSiteDude.

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