Just got this problem with Apple’s Mail, with the following message error:

Mail has undone actions on some messages so that you can redo the actions while online. Mail has saved other messages in mailbox “On My Mac” so that you can complete the actions while online.

Additional information: The IMAP command “APPEND (to Send Messages) failed with server error: Mailbox does not exist

To fix this issue, I used Onyx, and activated the “show hidden files”, then went to my Home folder > Library > Mail > IMAP-myemailaddress > .OfflineCache. And erased the content of that folder!

Problem fixed.

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Posted in Apple Mail, Macintosh Tips & Help