header_fetch_parse(name, value)
The email package calls this method with the name and value currently stored in the Message when that header is requested by the application program, and whatever the method returns is what is passed back to the application as the value of the header being retrieved. Note that there may be more than one header with the same name stored in the Message; the method is passed the specific name and value of the header destined to be returned to the application.
value may contain surrogateescaped binary data. There should be no surrogateescaped binary data in the value returned by the method.
There is no default implementation
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