求助：Apple Mail频繁卡在「Preparing to Move Messages」状态该如何处理？

Hey there, I’ve dealt with this exact Apple Mail headache multiple times with IMAP accounts—nothing’s more annoying than deleting a message, watching it disappear from the window, then realizing it never actually synced to the server, and that "Preparing to move messages: 1 of XXX" prompt just hangs forever. Let’s walk through practical fixes to get your Mail app working smoothly again:

• Force Quit and Restart Apple Mail
  Sometimes the IMAP sync process just locks up in a loop. Fully close Mail either by right-clicking its Dock icon and selecting Quit, or use the shortcut Cmd + Opt + Esc to force quit it. Wait 10-15 seconds, then reopen Mail. Often this quick reset clears the stuck queue.

• Rebuild the Problematic Mailbox
  Corrupted local sync data is a common culprit here:

  1. Select the mailbox giving you trouble (usually the Inbox) in the left sidebar.
  2. Head to the top menu bar and choose Mailbox > Rebuild.
     This will re-download your mailbox contents from the IMAP server and fix any wonky local data. Note: If you have tons of messages, this might take a few minutes—be patient.

• Reset the IMAP Account Connection
  A fresh connection to the server can break the sync logjam:

  1. Open Mail > Settings > Accounts and select your IMAP account.
  2. Click the Server Settings tab.
  3. Toggle off Enable this account, wait 5 seconds, then toggle it back on. This forces Mail to re-authenticate and start syncing from scratch.

• Clear Mail’s Cache Files
  Temporary cache files can get corrupted and cause sync issues:

  1. Quit Mail first.
  2. Open Finder, press Cmd + Shift + G, and paste this path: ~/Library/Caches/com.apple.mail
  3. Delete all files and folders inside this directory (these are just temporary files—Mail will recreate them when you reopen it).
  4. Restart Mail and test if deleting/moving messages works again.

• Remove Large or Problematic Messages
  Sometimes a single oversized message (think huge attachments) blocks the entire sync queue. Try sorting your mailbox by size (click the Size column header) and delete any massive messages one at a time. Doing this slowly can unblock the stuck "preparing to move" process.

If none of these steps work, first check if your email works fine via the web interface—if deleting messages works there, the issue is definitely on Apple Mail’s side. As a last resort, you can remove and re-add your IMAP account, but keep in mind you’ll have to re-set up any custom mailbox rules or signatures.

内容的提问来源于stack exchange，提问作者John Clements