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tuple. When the `addresses` is given, the `value` will be ignored.
The `charset` is no longer used.
Example::
set_header(my_message, 'From', ('Trac', 'noreply@ourcompany.com'))
set_header(my_message, 'To',
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* `related` infers that each part is in an integrated whole, like
images that are embedded in a html part.
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