The RFCs that define MIME say that alternatives parts representing the
same content, e.g. text/plain, text/rtf, and text/html, shall be in the
email in order worst to best when judged by their ability to represent
the content. This allows a user reading the email in an MUA that's not
MIME-capabable to come across the simplest format first, e.g. text/plain.
That's the theory, but many senders use a text/plain part akin to
"If you cannot read this, get a better MUA"
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