In Leopard, when you go offline while using Apple’s Mail program with an IMAP account, you may get the following error message, or something similar:
“Some actions taken while the account “xxxxxxx†was offline could not be completed online.
Mail has undone actions on some messages so that you can redo the actions while online. Mail has saved other messages in mailbox “Apple Mail To Do†in “On My Mac†so that you can complete the actions while online.
Additional information: The IMAP command “APPEND†(to Apple Mail To Do) failed with server error: Invalid mailbox name..â€
And if you click OK enough times, the program crashes.
There are two ways to correct this problem (both ways will preserve your mail settings (you will NOT have to reconfigure your Mail program) and your mail will appear in a few seconds after first opening the Mail program after performing the fix below):