As a user of the Mail.app in macOS Sierra, I am experiencing frequent intermittent crashes. Based on my reading of the crash report, this appears to be related to a couple of newly created mailbox rules in my Google Apps account. That rule is attempting to move messages to a subfolder upon receipt. However, the crash report indicates that this mailbox does not exist. When I edit my mailbox rules the dropdown for the target destination directory for these rules are blank, so I re-select the target destination directory and click save.
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The crash report dialog window that opens after a crash gives me the option to restart the Mail.app. When selecting this option to restart the application, it immediately crashes and re-presents the same crash report dialog window. This process will typically repeat 2-3 more times before successfully opening the Mail.app for another indeterminent period of time (usually a minutes to hours). At some point the application crashes again and the whole process starts over.
Things I have tried to fix the issue based on internet searches:
Deleting com.apple.mail
Rebuilding Mailbox
Deleteing and re-adding accounts
None of this has remediated the issue that I am having.
Below is stack trace from the Console.app
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Trying to create a mailbox operation without a mailbox name'
This exception is always immediately preceeded by:
*** Assertion failure in -[IMAPAppendCommand initWithMailboxName:], /Library/Caches/com.apple.xbs/Sources/Mail/Mail-3273/IMAP/Connection/Commands/IMAPMailboxCommand.m:32
My guess is that this issue has to do with the fact that the mailbox directories are out of sync with the Google Apps IMAP directories, but it is unclear how to resolve this mismatch.
For what its worth, here is the beginning of the crash report:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Trying to create a mailbox operation without a mailbox name'
abort() called
terminating with uncaught exception of type NSException