Page "MIME" Paragraph 103
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Most commonly, multipart / alternative is used for email with two parts, one plain text ( text / plain ) and one HTML ( text / html ).
The plain text part provides backwards compatibility while the HTML part allows use of formatting and hyperlinks.
Most email clients offer a user option to prefer plain text over HTML ; this is an example of how local factors may affect how an application chooses which " best " part of the message to display.
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