If you have run into the following message in Mail on your Mac, Macbook, or Macbook Air: “The message could not be moved to the mailbox “Trash”” (or some other mailbox) “The message *.emlx couldn’t be copied to “Messages” because an item with the same name already exists,” here is what to do to fix it.
We most often see this when someone is trying to delete a message (move it to the Trash folder), but it can happen in other situations as well. A reason that you might run into the “The message could not be moved to the mailbox “Trash”” situation specifically seems to be when you try to delete a huge number of messages at once, which may for some reason corrupt the trash folder.
Anyways, the fix is very easy.
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First, highlight (click on) the mail folder that you are trying to move the message to (in our example that is the Trash folder):
Next, go to the Mailbox menu, and click “Rebuild”:
Next..why, there is no next! That’s all you need to do!
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