The Emacs MIME library will respect the use-hard-newlines
variable (see section `Hard and Soft Newlines' in Emacs Manual) when encoding a message, and the
"format=flowed" Content-Type parameter when decoding a message.
On encoding text, lines terminated by soft newline characters are
filled together and wrapped after the column decided by
fill-flowed-encode-column. This variable controls how the text
will look in a client that does not support flowed text, the default
is to wrap after 66 characters. If hard newline characters are not
present in the buffer, no flow encoding occurs.
On decoding flowed text, lines with soft newline characters are filled
together and wrapped after the column decided by
fill-flowed-display-column. The default is to wrap after
fill-column.
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