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The email.HeaderParser module that is now used for parsing
headers consumes the rest of the body of the message when it
is used. If there was some way of telling the parser to stop
reading when it got to the end of the headers, I think this
problem would be fixed. Unfortunately, there is no external
interface to the email module's parser that lets us do this.
I hope we can come up with a reasonable solution that does
not involve reverting to using deprecated modules.

Thanks for the test case.