The following exception classes are defined in the mimelib.Errors module:
Situations where it can be raised include finding a ``Unix-From'' header after the first RFC 822 header of the message, finding a continuation line before the first RFC 822 header is found, or finding a line in the headers which is neither a header or a continuation line.
Situations where it can be raised include not being able to find the
starting or terminating boundary in a multipart/*
message.
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