In the Mail app on your Mac, choose File > Import Mailboxes. Select a source in the list, read the information that appears below the list, then click Continue. If you’re importing a mailbox exported from Mail or a folder in the ~/Library/Mail/V8 folder on another Mac, select Apple Mail. To get to the Mail folder on a Mac, click the desktop. · If your Apple Mail doesn't seem to be searchable and/or has become so slow it seems to hang your Mac -- or even displays incorrect email content, then . · Download CleanMyMac X. Drag it into your Applications folder. Open it and run a general Smart Scan to start. Then run Optimization and Maintenance scans (which you can choose from the left-side panel) to target specific areas, such as freeing up RAM and reviewing your login items. Repeat the process every month or so.
To add your user back to the mail app, follow these steps: Open the Mail app. Click on Mail from the top of the window. Click Add Account. Follow the steps to connect through your email provider. 7. Restart your Mac. Restarting your Mac is a go-to fix for many common problems and is always a good place to start. The slow transfer to USB Mac could be due to the file system. The Apple File System (APFS) replaces the HFS+ version focusing on SSDs, flash drives, and encryption. The reason for formatting your drive to APFS is because it works only with Mac operating systems. By default, the Mail app on your Mac downloads all email attachments you receive to the computer, eventually taking some serious amounts of storage space. As we've seen in the past, there is a way to tweak this and stop the Mail app from downloading all attachments, but it will still locally download attachments that you open.
If you find your Mac is running slowly, there are a number of potential causes that you can check. Your computer’s startup disk may not have enough free disk space. To make disk space available, you can move files to another disk or an external storage device, then delete files you no longer need on the startup disk. macOS can also help you. Look at Activity Monitor. With your Mail app open, start by navigating to the Menu Bar and select Window. In the Window drop-down menu, choose Activity (or press Option+Command+0.) Selecting Activity shows a small activity monitor that lists any messages currently downloading. Launch Mail, select one of your mailboxes and click on the Mailbox menu. At the bottom of the pane choose the Rebuild option. If you have a large mailbox, you can expect the process to take a few.
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