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There's something wrong with the handling of line
continuation in headers.
In the attached mbox the 'Message-id' header is read
and stored with a leading space. So message_id = '
<9B09D75DF5B3494BA06E6FE478CE9CC10526CFAF@mgtserver3.ontario.int.ec.gc.ca>'
when it's first read.
If you write this message out to a new mbox, it is
written with the leading space and without the newline.
THEN, if you read it in AGAIN, the parser ignores the
leading space.
One of these steps is buggy, I'm not sure which. It
seems to me that the value returned by
msg['Message_id'] should not change when the file is
written then re-read. In the initial read and final
reads above the value differs by a space.