The following exception classes are defined in the mailbox module:
The based class for all other module-specific exceptions.
Raised when a mailbox is expected but is not found, such as when instantiating
a Mailbox subclass with a path that does not exist (and with the
create parameter set to
False), or when opening a folder that does
Raised when a mailbox is not empty but is expected to be, such as when deleting
a folder that contains messages.
Raised when some mailbox-related condition beyond the control of the program
causes it to be unable to proceed, such as when failing to acquire a lock that
another program already holds a lock, or when a uniquely-generated file name
Raised when the data in a file cannot be parsed, such as when an MH
instance attempts to read a corrupted .mh_sequences file.
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