Important! Select at least 2 folders to import. eml were exported.įile > Import Mailboxes… > Import data from Apple Mail As a reference, for 10 000 emails, it took over 2 hours until the. eml files appear, but you can check in Activity Monitor if Mail is doing something, it'll be using a significant percent of processor (10%-90% of a core in my case). Note that it might take a very long time before the. 
The mails are copied into the folder as EML. Select all mails inside and drag & drop them into the corresponding folder in the finder.
In Mail.app select one mailbox at a time. In any case you should create a minimum of 2 folders. In Finder create a folder for every mailbox you want to copy. There is a simple workaround using EMLs instead of. This uncertainty is very frustrating especially when you want to move thousands of E-Mails. The odd thing is that Mail.app doesn't tell you which E-Mails have not been copied. The partially imported mailboxes are located in the mailbox named “Import” in the mailboxes list. mbox files to my new Macbook: Some messages could not be imported. I pretty much always got the following error when I imported the previously exported. mbox (Mail.app > Mailbox > Export Mailbox.) I figured out a pretty easy way to copy all E-Mails from my old MacBook to my new machine with Mail.app.ĭon't export your mailboxes as. 
Solving the annoying Some messages could not be imported - Error in Mail.app.
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